fix(dropdown): explicitly markForCheck() (#566)

components/dropdown/dropdown.directive.ts

@@ -1,6 +1,6 @@
 import {
  Directive, OnInit, OnDestroy, Input, Output, HostBinding, EventEmitter,
- ElementRef
+ ElementRef, ChangeDetectorRef
 } from '@angular/core';
 import {dropdownService, NONINPUT} from './dropdown.service';
 
@@ -30,10 +30,13 @@ export class DropdownDirective implements OnInit, OnDestroy {
  public el:ElementRef;
  private _isOpen:boolean;
 
- public constructor(el:ElementRef) {
+ private _changeDetector: ChangeDetectorRef;
+
+ public constructor(el:ElementRef, ref:ChangeDetectorRef) {
  // @Query('dropdownMenu', {descendants: false})
  // dropdownMenuList:QueryList<ElementRef>) {
  this.el = el;
+ this._changeDetector = ref;
  // todo: bind to route change event
  }
 
@@ -56,6 +59,7 @@ export class DropdownDirective implements OnInit, OnDestroy {
  }
  this.onToggle.emit(this.isOpen);
  this.isOpenChange.emit(this.isOpen);
+ this._changeDetector.markForCheck();
  // todo: implement call to setIsOpen if set and function
  }