diff --git a/modules/lstream/utils.js b/modules/lstream/utils.js
index 5ffcacf9..92c86f6a 100644
--- a/modules/lstream/utils.js
+++ b/modules/lstream/utils.js
@@ -1,2 +1,18 @@
 
 export const NOT_INITIALIZED = Object.freeze({});
+
+export function propsChangeTracker(props, onChange) {
+
+  const values = props.map(() => NOT_INITIALIZED);
+  
+  return function(obj) {
+    for (let i = 0; i < props.length; i++) {
+      const prop = props[i];
+      const prevValue = values[i];
+      const currValue = obj[prop];
+      if (prevValue !== currValue) {
+        onChange(obj, prop, currValue, prevValue);
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/modules/ui/components/Folder.jsx b/modules/ui/components/Folder.jsx
index 8dba4e03..1b825779 100644
--- a/modules/ui/components/Folder.jsx
+++ b/modules/ui/components/Folder.jsx
@@ -26,11 +26,15 @@ export default class Folder extends React.Component{
   render() {
     let {title, closable, className, children} = this.props;
     return <div className={cx(ls.root, className)}>
-      <div className={ls.title} onClick={closable ? this.tweakClose : null}>
-        <span className={ls.handle}><Fa fw icon={this.isClosed() ? 'chevron-right' : 'chevron-down'}/></span> 
-        {' '}{title}
-      </div>
+      <Title title={title} onClick={closable ? this.tweakClose : null} isClosed={this.isClosed()}/>
       {!this.isClosed() && children}
     </div>
   }
 }
+
+export function Title({title, isClosed, onClick}) {
+  return <div className={ls.title} onClick={onClick}>
+    <span className={ls.handle}><Fa fw icon={isClosed ? 'chevron-right' : 'chevron-down'}/></span>
+    {' '}{title}
+  </div>;
+}
diff --git a/modules/ui/components/controls/CheckboxControl.jsx b/modules/ui/components/controls/CheckboxControl.jsx
index f510abdc..78f4efe5 100644
--- a/modules/ui/components/controls/CheckboxControl.jsx
+++ b/modules/ui/components/controls/CheckboxControl.jsx
@@ -6,6 +6,6 @@ export default class CheckboxControl extends React.Component {
     let {onChange, value} = this.props;
     return <input type='checkbox' 
               defaultValue={value} 
-              onChange={e => onChange(e.target.value)}  /> 
+              onChange={e => onChange(e.target.checked)}  /> 
   }
 }
diff --git a/modules/ui/components/controls/FormSection.jsx b/modules/ui/components/controls/FormSection.jsx
new file mode 100644
index 00000000..f4c2e2da
--- /dev/null
+++ b/modules/ui/components/controls/FormSection.jsx
@@ -0,0 +1,14 @@
+import React from 'react';
+import {Title} from '../Folder';
+
+export class StackSection extends React.Component {
+  
+  render() {
+    const {title, children} = this.props;
+    return <React.Fragment>
+      <Title title={title} />
+      {children}
+    </React.Fragment>;
+  }
+  
+}
\ No newline at end of file
diff --git a/web/app/brep/geom/curves/brepCurve.js b/web/app/brep/geom/curves/brepCurve.js
index bdadbe5b..8b5284a8 100644
--- a/web/app/brep/geom/curves/brepCurve.js
+++ b/web/app/brep/geom/curves/brepCurve.js
@@ -18,8 +18,16 @@ export default class BrepCurve {
     this.uMid = (uMax - uMin) * 0.5;
   }
 
+  get degree() {
+    return this.impl.degree();
+  }
+  
   translate(vector) {
     const tr = new Matrix3().translate(vector.x, vector.y, vector.z);
+    return this.transform(tr);
+  }
+
+  transform(tr) {
     return new BrepCurve(this.impl.transform(tr.toArray()), this.uMin, this.uMax);
   }
 
diff --git a/web/app/cad/actions/coreActions.js b/web/app/cad/actions/coreActions.js
index aad54724..dedfac07 100644
--- a/web/app/cad/actions/coreActions.js
+++ b/web/app/cad/actions/coreActions.js
@@ -65,7 +65,7 @@ export default [
       label: 'deselect all',
       info: 'deselect everything',
     },
-    invoke: (context) => context.services.selection.deselectAll()
+    invoke: (context) => context.services.pickControl.deselectAll()
   },
 
   {
diff --git a/web/app/cad/craft/cutExtrude/cutExtrude.js b/web/app/cad/craft/cutExtrude/cutExtrude.js
index 42aee3b3..250ed2c7 100644
--- a/web/app/cad/craft/cutExtrude/cutExtrude.js
+++ b/web/app/cad/craft/cutExtrude/cutExtrude.js
@@ -27,18 +27,42 @@ export function doOperation(params, {cadRegistry, sketcher}, cut) {
 
 export function resolveExtrudeVector(cadRegistry, face, params, invert) {
   let vector = null;
-  if (params.vector) {
-    const datumAxis = cadRegistry.findDatumAxis(params.vector);
+  if (params.datumAxisVector) {
+    const datumAxis = cadRegistry.findDatumAxis(params.datumAxisVector);
     if (datumAxis) {
       vector = datumAxis.dir;
       invert = false;
     }
+  } else if (params.edgeVector) {
+    const edge = cadRegistry.findEdge(params.edgeVector);
+    const curve = edge.brepEdge.curve;
+    if (curve.degree === 1) {
+      vector = edge.brepEdge.curve.tangentAtParam(edge.brepEdge.curve.uMin);
+      if (vector.dot(face.csys.z) < 0 === invert) {
+        vector = vector.negate();
+      }
+      invert = false;
+    }
+  } else if (params.sketchSegmentVector) {
+    const mSegment = cadRegistry.findSketchObject(params.sketchSegmentVector);
+    if (mSegment.sketchPrimitive.isSegment) {
+      let [a, b] = mSegment.sketchPrimitive.tessellate().map(mSegment.face.sketchToWorldTransformation.apply);
+      vector = b.minus(a)._normalize();
+      if (vector.dot(face.csys.z) < 0 === invert) {
+        vector._negate();
+      }
+      invert = false;
+    }
   }
   if (!vector) {
     invert = !invert;  
     vector = face.csys.z; 
   }
   
+  if (params.flip) {
+    invert = !invert;
+  }
+  
   let value = params.value;
   if (value < 0) {
     value = Math.abs(value);
@@ -60,12 +84,17 @@ export function getEncloseDetails(params, contours, target, csys, sketchSurface,
     if (invert) contour.reverse();
 
     const lidPath = [];
-    let applyPrism = !math.equal(params.prism, 1);   
+    let applyPrism = !math.equal(params.prism, 1);
+    let prismTr = null;
+    if (applyPrism) {
+      prismTr = new Matrix3();
+      prismTr.scale(params.prism, params.prism, params.prism);
+    }
     for (let i = 0; i < basePath.length; ++i) {
       const curve = basePath[i];
       let lidCurve = curve.translate(target);
       if (applyPrism) {
-        lidCurve = lidCurve.offset(params.prism);
+        lidCurve = lidCurve.transform(prismTr);
       }
       lidPath.push(lidCurve);
     }
diff --git a/web/app/cad/craft/cutExtrude/cutOperation.js b/web/app/cad/craft/cutExtrude/cutOperation.js
index 8dcaa6db..d117cffd 100644
--- a/web/app/cad/craft/cutExtrude/cutOperation.js
+++ b/web/app/cad/craft/cutExtrude/cutOperation.js
@@ -4,6 +4,7 @@ import {createPreviewGeomProvider} from './previewer';
 import {Cut} from './cutExtrude';
 import {requiresFaceSelection} from '../../actions/actionHelpers';
 import schema from './schema';
+import {onParamsUpdate} from './extrudeOperation';
 
 export default {
   id: 'CUT',
@@ -11,6 +12,7 @@ export default {
   icon: 'img/cad/cut',
   info: 'makes a cut based on 2D sketch',
   paramsInfo:  ({value}) => `(${r(value)})`,
+  onParamsUpdate, 
   previewGeomProvider: createPreviewGeomProvider(true),
   run: Cut,
   actionParams: {
diff --git a/web/app/cad/craft/cutExtrude/extrudeOperation.js b/web/app/cad/craft/cutExtrude/extrudeOperation.js
index c6efaeb0..dda12b91 100644
--- a/web/app/cad/craft/cutExtrude/extrudeOperation.js
+++ b/web/app/cad/craft/cutExtrude/extrudeOperation.js
@@ -11,6 +11,7 @@ export default {
   icon: 'img/cad/extrude',
   info: 'extrudes 2D sketch',
   paramsInfo:  ({value}) => `(${r(value)})`,
+  onParamsUpdate,
   previewGeomProvider: createPreviewGeomProvider(false),
   run: Extrude,
   actionParams: {
@@ -20,3 +21,14 @@ export default {
   schema
 };
 
+const INVARIANT = ['datumAxisVector', 'edgeVector', 'sketchSegmentVector'];
+
+export function onParamsUpdate(params, name, value) {
+  if (INVARIANT.includes(name)) {
+    INVARIANT.forEach(param => {
+      if (param !== name) {
+        delete params[param];
+      }
+    })
+  }
+}
\ No newline at end of file
diff --git a/web/app/cad/craft/cutExtrude/form.js b/web/app/cad/craft/cutExtrude/form.js
index 89931d3f..f264cfcf 100644
--- a/web/app/cad/craft/cutExtrude/form.js
+++ b/web/app/cad/craft/cutExtrude/form.js
@@ -1,7 +1,8 @@
 import React from 'react';
-import {NumberField} from '../wizard/components/form/Fields';
+import {CheckboxField, NumberField} from '../wizard/components/form/Fields';
 import {Group} from '../wizard/components/form/Form';
 import Entity from '../wizard/components/form/Entity';
+import {StackSection} from 'ui/components/controls/FormSection';
 
 export default function (valueLabel) {
   return function PrismForm() {
@@ -9,7 +10,12 @@ export default function (valueLabel) {
       <NumberField name='value' defaultValue={50} label={valueLabel}/>
       <NumberField name='prism' defaultValue={1} min={0} step={0.1} round={1}/>
       <Entity name='face'/>
-      <Entity name='vector' />
+      <StackSection title='vector'>
+        <Entity label='datum axis' name='datumAxisVector' />
+        <Entity label='edge' name='edgeVector' />
+        <Entity label='sketch segment' name='sketchSegmentVector' />
+        <CheckboxField name='flip'/>
+      </StackSection>
     </Group>;
   };
 }
\ No newline at end of file
diff --git a/web/app/cad/craft/cutExtrude/schema.js b/web/app/cad/craft/cutExtrude/schema.js
index 4cb5674d..5d680392 100644
--- a/web/app/cad/craft/cutExtrude/schema.js
+++ b/web/app/cad/craft/cutExtrude/schema.js
@@ -20,9 +20,22 @@ export default {
     type: 'face',
     defaultValue: {type: 'selection'}
   },
-  vector: {
+  datumAxisVector: {
     type: 'datumAxis',
+    optional: true
+  },
+  edgeVector: {
+    type: 'edge',
     optional: true,
-    defaultValue: {type: 'selection'}
+    accept: edge => edge.brepEdge.curve.degree === 1
+  },
+  sketchSegmentVector: {
+    type: 'sketchObject',
+    optional: true,
+    accept: obj => obj.isSegment
+  },
+  flip: {
+    type: 'boolean',
+    defaultValue: false,
   }
 }
diff --git a/web/app/cad/craft/e0/e0Plugin.js b/web/app/cad/craft/e0/e0Plugin.js
index 6c83809a..731d401a 100644
--- a/web/app/cad/craft/e0/e0Plugin.js
+++ b/web/app/cad/craft/e0/e0Plugin.js
@@ -188,7 +188,7 @@ function readSketch(face, request, sketcher) {
   let paths = sketch.fetchContours().map(c => {
     let path = [];
     c.segments.forEach(s => {
-      if (s.isCurve()) {
+      if (s.isCurve) {
         if (s.constructor.name === 'Circle') {
           const dir = face.csys.z.data();
           path.push({TYPE: CURVE_TYPES.CIRCLE, c: tr.apply(s.c).data(), dir, r: s.r});
diff --git a/web/app/cad/craft/materializeParams.js b/web/app/cad/craft/materializeParams.js
index fb2397d1..7a78960f 100644
--- a/web/app/cad/craft/materializeParams.js
+++ b/web/app/cad/craft/materializeParams.js
@@ -11,7 +11,7 @@ export default function materializeParams(services, params, schema, result, erro
     }
     let value = params[field];
     if (value === undefined || value === null || value === '') {
-      if (!md.optional) {
+      if (!md.optional && !md.hasOwnProperty('defaultValue')) {
         errors.push({path: [...parentPath, field], message: 'required'});
       }
     } else {
@@ -41,6 +41,8 @@ export default function materializeParams(services, params, schema, result, erro
         if (typeof value !== 'string') {
           errors.push({path: [...parentPath, field], message: 'not a string type'});
         }
+      } else if (md.type === 'boolean') {
+        value = !!value;
       } else if (md.type === 'enum') {
         if (md.values.indexOf(value) === -1) {
           value = md.defaultValue || md.values[0]; 
diff --git a/web/app/cad/craft/operationPlugin.js b/web/app/cad/craft/operationPlugin.js
index b2754c84..537b123e 100644
--- a/web/app/cad/craft/operationPlugin.js
+++ b/web/app/cad/craft/operationPlugin.js
@@ -88,6 +88,7 @@ function createSchemaIndex(schema) {
     }
   }
   return {entitiesByType, entitiesByParam,
-    entityParams: Object.keys(entitiesByParam)
+    entityParams: Object.keys(entitiesByParam),
+    params: Object.keys(schema)
   };
 }
\ No newline at end of file
diff --git a/web/app/cad/craft/wizard/components/Wizard.jsx b/web/app/cad/craft/wizard/components/Wizard.jsx
index 80fbc880..3c408af7 100644
--- a/web/app/cad/craft/wizard/components/Wizard.jsx
+++ b/web/app/cad/craft/wizard/components/Wizard.jsx
@@ -22,7 +22,7 @@ export default class Wizard extends React.Component {
   };
 
   updateParam = (name, value) => {
-    this.props.context.updateParams(params => params[name] = value);
+    this.props.context.updateParam(name, value);
   };
 
   setActiveParam = param => {
diff --git a/web/app/cad/craft/wizard/wizardPlugin.js b/web/app/cad/craft/wizard/wizardPlugin.js
index 85e051db..3ccac786 100644
--- a/web/app/cad/craft/wizard/wizardPlugin.js
+++ b/web/app/cad/craft/wizard/wizardPlugin.js
@@ -3,6 +3,8 @@ import initializeBySchema from '../intializeBySchema';
 import {clone, EMPTY_OBJECT} from 'gems/objects';
 import materializeParams from '../materializeParams';
 import {createFunctionList} from 'gems/func';
+import {onParamsUpdate} from '../cutExtrude/extrudeOperation';
+import {propsChangeTracker} from '../../../../../modules/lstream/utils';
 
 export function activate(ctx) {
 
@@ -84,9 +86,18 @@ export function activate(ctx) {
       const state$ = state({});
       const updateParams = mutator => workingRequest$.mutate(data => mutator(data.params));
       const updateState = mutator => state$.mutate(state => mutator(state));
+      const updateParam = (name, value) => {
+        updateParams(params => {
+          if (operation.onParamsUpdate) {
+            operation.onParamsUpdate(params, name, value, params[name]);
+          }  
+          params[name] = value;
+        });
+      };
+
       const disposerList = createFunctionList();
       wizCtx = {
-        workingRequest$, materializedWorkingRequest$, state$, updateParams, updateState,
+        workingRequest$, materializedWorkingRequest$, state$, updateParams, updateParam, updateState,
         operation, changingHistory,
         addDisposer: disposerList.add,
         dispose: disposerList.call,
diff --git a/web/app/cad/craft/wizard/wizardSelectionPlugin.js b/web/app/cad/craft/wizard/wizardSelectionPlugin.js
index 87dafd7c..9be09d6d 100644
--- a/web/app/cad/craft/wizard/wizardSelectionPlugin.js
+++ b/web/app/cad/craft/wizard/wizardSelectionPlugin.js
@@ -31,20 +31,20 @@ export function activate(ctx) {
   });
 }
 
-const singleUpdater = (params, param, id) =>  params[param] = id;
-const arrayUpdater = (params, param, id) =>  {
-  let arr = params[param];
+const singleValue = (id, current) =>  id;
+const arrayValue = (id, arr) =>  {
   if (!arr) {
-    params[param] = [id];
+    return [id];
   } 
   if (arr.indexOf(id) === -1) {
     arr.push(id);
   }
+  return arr;
 };
 
 function createPickHandlerFromSchema(wizCtx) {
-  function update(paramsMutator, paramToMakeActive) {
-    wizCtx.updateParams(paramsMutator);
+  function update(param, value, paramToMakeActive) {
+    wizCtx.updateParam(param, value);
     wizCtx.updateState(state => {
       state.activeParam = paramToMakeActive;
     });
@@ -62,11 +62,9 @@ function createPickHandlerFromSchema(wizCtx) {
     const activeEntity = state.activeParam && entitiesByParam[state.activeParam];
 
     function select(param, entity, md, id) {
-      const updater = md.type === 'array' ? arrayUpdater : singleUpdater;
+      const valueGetter = md.type === 'array' ? arrayValue : singleValue;
       let paramToMakeActive = getNextActiveParam(param, entity, md);
-      update(params => {
-        updater(params, param, id);
-      }, paramToMakeActive);
+      update(param, valueGetter(id, params[param]), paramToMakeActive);
     }
 
     function getNextActiveParam(currParam, entity, currMd) {
@@ -98,16 +96,12 @@ function createPickHandlerFromSchema(wizCtx) {
       for (let param of entityParams) {
         let val = params[param];
         if (val === id) {
-          update(params => {
-            params[param] = undefined;
-          }, param);
+          update(param, undefined, param);
           return true;
         } else if (Array.isArray(val)) {
           let index = val.indexOf(id);
           if (index !== -1) {
-            update(params => {
-              params[param].splice(index, 1)
-            }, param);
+            update(param, params[param].splice(index, 1), param);
             return true;
           }
         }
diff --git a/web/app/cad/sketch/sketchModel.js b/web/app/cad/sketch/sketchModel.js
index fd93ae42..0e75514c 100644
--- a/web/app/cad/sketch/sketchModel.js
+++ b/web/app/cad/sketch/sketchModel.js
@@ -28,10 +28,14 @@ class SketchPrimitive {
     return tessellation;
   }
 
-  isCurve() {
+  get isCurve() {
     return this.constructor.name !== 'Segment';
   }
 
+  get isSegment() {
+    return !this.isCurve;
+  }
+
   toNurbs(csys) {
     let verbNurbs = this.toVerbNurbs(csys.outTransformation.apply, csys);
     if (this.inverted) {
diff --git a/web/app/cad/sketch/sketchReader.js b/web/app/cad/sketch/sketchReader.js
index ee9f422b..43e6f569 100644
--- a/web/app/cad/sketch/sketchReader.js
+++ b/web/app/cad/sketch/sketchReader.js
@@ -144,7 +144,7 @@ function findClosedContoursFromPairedCurves(segments, result) {
     for (let j = i; j < segments.length; j++) {
       if (i == j) continue;
       const s2 = segments[j];
-      if (s1.isCurve() && s2.isCurve()) {
+      if (s1.isCurve && s2.isCurve) {
         let paired = false;
         if (math.strictEqual2D(s1.a, s2.a) && math.strictEqual2D(s1.b, s2.b)) {
           paired = true;