Fix reactive forms

src/lib/checkbox/checkbox.ts

@@ -193,6 +193,14 @@ export class MdCheckbox implements ControlValueAccessor {
   registerOnTouched(fn: any) {
     this.onTouched = fn;
   }
+
+  /**
+   * Implemented as part of ControlValueAccessor.
+   * TODO: internal
+   */
+  setDisabledState(isDisabled: boolean): void {
+      this.disabled = isDisabled;
+  }
 
   private _transitionCheckState(newState: TransitionCheckState) {
     let oldState = this._currentCheckState;

src/lib/input/input.ts

@@ -240,6 +240,14 @@ export class MdInput implements ControlValueAccessor, AfterContentInit, OnChange
   registerOnTouched(fn: any) {
     this._onTouchedCallback = fn;
   }
+
+    /**
+   * Implemented as part of ControlValueAccessor.
+   * TODO: internal
+   */
+  setDisabledState(isDisabled: boolean): void {
+      this.disabled = isDisabled;
+    }
 
   /** TODO: internal */
   ngAfterContentInit() {

src/lib/radio/radio.ts

@@ -229,6 +229,15 @@ export class MdRadioGroup implements AfterContentInit, ControlValueAccessor {
   registerOnTouched(fn: any) {
     this.onTouched = fn;
   }
+
+  /**
+   * Implemented as part of ControlValueAccessor.
+   * TODO: internal
+   */
+  setDisabledState(isDisabled: boolean): void {
+      this.disabled = isDisabled;
+    }
+
 }