diff --git a/modules/angular2/forms.js b/modules/angular2/forms.js
index e943dd2d96..40f02caae1 100644
--- a/modules/angular2/forms.js
+++ b/modules/angular2/forms.js
@@ -1,4 +1,5 @@
 export * from './src/forms/model';
 export * from './src/forms/directives';
 export * from './src/forms/validators';
-export * from './src/forms/validator_directives';
\ No newline at end of file
+export * from './src/forms/validator_directives';
+export * from './src/forms/form_builder';
\ No newline at end of file
diff --git a/modules/angular2/src/forms/model.js b/modules/angular2/src/forms/model.js
index e6eba381da..7f481e56ee 100644
--- a/modules/angular2/src/forms/model.js
+++ b/modules/angular2/src/forms/model.js
@@ -11,7 +11,6 @@ export const INVALID = "INVALID";
 //  get status():string;
 //  get valid():boolean;
 //  get errors():Map;
-//  get active():boolean {}
 //  updateValue(value:any){}
 //  setParent(parent){}
 //}
@@ -29,10 +28,6 @@ export class AbstractControl {
     this._dirty = true;
   }
 
-  get active():boolean {
-    return true;
-  }
-
   get value() {
     this._updateIfNeeded();
     return this._value;
@@ -90,13 +85,30 @@ export class Control extends AbstractControl {
 
 export class ControlGroup extends AbstractControl {
   controls;
+  optionals;
 
-  constructor(controls, validator:Function = controlGroupValidator) {
+  constructor(controls, optionals = null, validator:Function = controlGroupValidator) {
     super(validator);
     this.controls = controls;
+    this.optionals = isPresent(optionals) ? optionals : {};
     this._setParentForControls();
   }
 
+  include(controlName:string) {
+    this._dirty = true;
+    StringMapWrapper.set(this.optionals, controlName, true);
+  }
+
+  exclude(controlName:string) {
+    this._dirty = true;
+    StringMapWrapper.set(this.optionals, controlName, false);
+  }
+
+  contains(controlName:string) {
+    var c = StringMapWrapper.contains(this.controls, controlName);
+    return c && this._included(controlName);
+  }
+
   _setParentForControls() {
     StringMapWrapper.forEach(this.controls, (control, name) => {
       control.setParent(this);
@@ -115,7 +127,7 @@ export class ControlGroup extends AbstractControl {
   _reduceValue() {
     var newValue = {};
     StringMapWrapper.forEach(this.controls, (control, name) => {
-      if (control.active) {
+      if (this._included(name)) {
         newValue[name] = control.value;
       }
     });
@@ -126,56 +138,9 @@ export class ControlGroup extends AbstractControl {
     this._dirty = true;
     this._updateParent();
   }
-}
 
-export class OptionalControl {
-  _control:Control;
-  _cond:boolean;
-
-  constructor(control:Control, cond:boolean) {
-    super();
-    this._control = control;
-    this._cond = cond;
-  }
-
-  get active():boolean {
-    return this._cond;
-  }
-
-  get value() {
-    return this._control.value;
-  }
-
-  get status() {
-    return this._control.status;
-  }
-
-  get errors() {
-    return this._control.errors;
-  }
-
-  set validator(v) {
-    this._control.validator = v;
-  }
-
-  get validator() {
-    return this._control.validator;
-  }
-
-  set cond(value:boolean){
-    this._cond = value;
-    this._control._updateParent();
-  }
-
-  get cond():boolean{
-    return this._cond;
-  }
-
-  updateValue(value:any){
-    this._control.updateValue(value);
-  }
-
-  setParent(parent){
-    this._control.setParent(parent);
+  _included(controlName:string):boolean {
+    var isOptional = StringMapWrapper.contains(this.optionals, controlName);
+    return !isOptional || StringMapWrapper.get(this.optionals, controlName);
   }
 }
\ No newline at end of file
diff --git a/modules/angular2/src/forms/validators.js b/modules/angular2/src/forms/validators.js
index 1df7d22b93..9888f12648 100644
--- a/modules/angular2/src/forms/validators.js
+++ b/modules/angular2/src/forms/validators.js
@@ -24,7 +24,7 @@ export function compose(validators:List<Function>):Function {
 export function controlGroupValidator(c:ControlGroup) {
   var res = {};
   StringMapWrapper.forEach(c.controls, (control, name) => {
-    if (control.active && isPresent(control.errors)) {
+    if (c.contains(name) && isPresent(control.errors)) {
       StringMapWrapper.forEach(control.errors, (value, error) => {
         if (! StringMapWrapper.contains(res, error)) {
           res[error] = [];
diff --git a/modules/angular2/test/forms/model_spec.js b/modules/angular2/test/forms/model_spec.js
index 65e405e8f9..8b81f30bcf 100644
--- a/modules/angular2/test/forms/model_spec.js
+++ b/modules/angular2/test/forms/model_spec.js
@@ -84,56 +84,68 @@ export function main() {
           expect(g.errors).toEqual(null);
         });
       });
-    });
 
-    describe("OptionalControl", () => {
-      it("should read properties from the wrapped component", () => {
-        var wrapperControl = new Control("value", validations.required);
-        var c = new OptionalControl(wrapperControl, true);
+      describe("optional components", () => {
+        describe("contains", () => {
+          var group;
 
-        expect(c.value).toEqual('value');
-        expect(c.status).toEqual('VALID');
-        expect(c.validator).toEqual(validations.required);
-      });
+          beforeEach(() => {
+            group = new ControlGroup({
+              "required": new Control("requiredValue"),
+              "optional": new Control("optionalValue")
+            }, {
+              "optional": false
+            });
+          });
 
-      it("should update the wrapped component", () => {
-        var wrappedControl = new Control("value");
-        var c = new OptionalControl(wrappedControl, true);
+          // rename contains into has
+          it("should return false when the component is not included", () => {
+            expect(group.contains("optional")).toEqual(false);
+          })
 
-        c.validator = validations.required;
-        c.updateValue("newValue");
+          it("should return false when there is no component with the given name", () => {
+            expect(group.contains("something else")).toEqual(false);
+          });
 
+          it("should return true when the component is included", () => {
+            expect(group.contains("required")).toEqual(true);
 
-        expect(wrappedControl.validator).toEqual(validations.required);
-        expect(wrappedControl.value).toEqual('newValue');
-      });
+            group.include("optional");
 
-      it("should not include an inactive component into the group value", () => {
-        var group = new ControlGroup({
-          "required" : new Control("requiredValue"),
-          "optional" : new OptionalControl(new Control("optionalValue"), false)
+            expect(group.contains("optional")).toEqual(true);
+          });
         });
 
-        expect(group.value).toEqual({"required" : "requiredValue"});
+        it("should not include an inactive component into the group value", () => {
+          var group = new ControlGroup({
+            "required": new Control("requiredValue"),
+            "optional": new Control("optionalValue")
+          }, {
+            "optional": false
+          });
 
-        group.controls["optional"].cond = true;
+          expect(group.value).toEqual({"required" : "requiredValue"});
 
-        expect(group.value).toEqual({"required" : "requiredValue", "optional" : "optionalValue"});
-      });
+          group.include("optional");
 
-      it("should not run validations on an inactive component", () => {
-        var group = new ControlGroup({
-          "required" : new Control("requiredValue", validations.required),
-          "optional" : new OptionalControl(new Control("", validations.required), false)
+          expect(group.value).toEqual({"required" : "requiredValue", "optional" : "optionalValue"});
         });
 
-        expect(group.valid).toEqual(true);
+        it("should not run validations on an inactive component", () => {
+          var group = new ControlGroup({
+            "required": new Control("requiredValue", validations.required),
+            "optional": new Control("", validations.required)
+          }, {
+            "optional": false
+          });
 
-        group.controls["optional"].cond = true;
+          expect(group.valid).toEqual(true);
 
-        expect(group.valid).toEqual(false);
+          group.include("optional");
+
+          expect(group.valid).toEqual(false);
+        });
       });
     });
-
   });
-}
\ No newline at end of file
+}