diff --git a/src/components/angular2-modal/models/dialog-ref-stack.ts b/src/components/angular2-modal/models/dialog-ref-stack.ts
index bdcc9dfa..8f293091 100644
--- a/src/components/angular2-modal/models/dialog-ref-stack.ts
+++ b/src/components/angular2-modal/models/dialog-ref-stack.ts
@@ -1,49 +1,91 @@
 import { DialogRef } from './dialog-ref';
 
+const BASKET_GROUP = {};
+
 /**
  * A dumb stack implementation over an array.
  */
 export class DialogRefStack<T> {
-    private _stack: DialogRef<T>[] = [];
+  private _stack: DialogRef<T>[];
+  private _stackMap: Map<DialogRef<T>, any>;
 
+  get length(): number {
+    return this._stack.length;
+  }
 
-    push(dialogRef: DialogRef<T>): void {
-        let idx = this._stack.indexOf(dialogRef);
-        if (idx === -1) this._stack.push(dialogRef);
-    }
+  constructor() {
+    this._stack = [];
+    this._stackMap = new Map<DialogRef<T>, any>();
+  }
 
-    /**
-     * Push a DialogRef into the stack and manage it so when it's done
-     * it will automatically kick itself out of the stack.
-     * @param dialogRef
-     */
-    pushManaged(dialogRef: DialogRef<T>): void {
-        this.push(dialogRef);
+  push(dialogRef: DialogRef<T>, group?: any): void {
+    if (this._stack.indexOf(dialogRef) === -1) {
+      this._stack.push(dialogRef);
+      this._stackMap.set(dialogRef, group || BASKET_GROUP);
     }
+  }
 
-    pop(): void {
-        this._stack.pop();
-    }
+  /**
+   * Push a DialogRef into the stack and manage it so when it's done
+   * it will automatically kick itself out of the stack.
+   * @param dialogRef
+   */
+  pushManaged(dialogRef: DialogRef<T>, group?: any): void {
+    this.push(dialogRef, group);
+    dialogRef.onDestroy.subscribe(() => this.remove(dialogRef));
+  }
 
-    /**
-     * Remove a DialogRef from the stack.
-     * @param dialogRef
-     */
-    remove(dialogRef: DialogRef<T>): void {
-        let idx = this._stack.indexOf(dialogRef);
-        if (idx > -1) this._stack.splice(idx, 1);
+  pop(): DialogRef<T> {
+    const dialogRef = this._stack.pop();
+    this._stackMap.delete(dialogRef);
+    return dialogRef;
+  }
+
+  /**
+   * Remove a DialogRef from the stack.
+   * @param dialogRef
+   */
+  remove(dialogRef: DialogRef<T>): void {
+    let idx = this.indexOf(dialogRef);
+    if (idx > -1) {
+      this._stack.splice(idx, 1);
+      this._stackMap.delete(dialogRef);
     }
+  }
 
+  index(index: number): DialogRef<T> {
+    return this._stack[index];
+  }
 
-    index(index: number): DialogRef<T> {
-        return this._stack[index];
-    }
+  indexOf(dialogRef: DialogRef<T>): number {
+     return this._stack.indexOf(dialogRef);
+  }
+
+  groupOf(dialogRef: DialogRef<T>): any {
+    return this._stackMap.get(dialogRef);
+  }
 
-    indexOf(dialogRef: DialogRef<T>): number {
-        return this._stack.indexOf(dialogRef);
+  groupBy(group: any): DialogRef<T>[] {
+    let arr = [];
+    if (group) {
+      this._stackMap.forEach( (value, key) => {
+        if (value === group) {
+          arr.push(key);
+        }
+      });
     }
+    return arr;
+  }
 
-    get length(): number {
-        return this._stack.length;
+  groupLength(group: any): number {
+    let count = 0;
+    if (group) {
+      this._stackMap.forEach( (value, key) => {
+        if (value === group) {
+          count++;
+        }
+      });
     }
+    return count;
+  }
 }
diff --git a/src/components/angular2-modal/models/dialog-ref.ts b/src/components/angular2-modal/models/dialog-ref.ts
index c62a607f..76f7d896 100644
--- a/src/components/angular2-modal/models/dialog-ref.ts
+++ b/src/components/angular2-modal/models/dialog-ref.ts
@@ -102,20 +102,23 @@ export class DialogRef<T> {
   destroy() {
     if (this.destroyed !== true) {
       this.destroyed = true;
-      this._onDestroy.next(null);
-
-      this._onDestroy.complete();
 
       if (typeof this.overlayRef.instance.canDestroy === 'function') {
         this.overlayRef.instance.canDestroy()
           .catch( () => {})
-          .then ( () => this.overlayRef.destroy() );
+          .then ( () => this._destroy() );
       } else {
-        this.overlayRef.destroy();
+        this._destroy();
       }
     }
   }
 
+  private _destroy(): void {
+    this._onDestroy.next(null);
+    this._onDestroy.complete();
+    this.overlayRef.destroy()
+  }
+
   private _fireHook<T>(name: 'beforeClose' | 'beforeDismiss'): Promise<T> {
     const gurad = this.closeGuard,
           fn: Function = gurad && typeof gurad[name] === 'function' && gurad[name];
diff --git a/src/components/angular2-modal/overlay/overlay.service.ts b/src/components/angular2-modal/overlay/overlay.service.ts
index e6f62832..3572f60c 100644
--- a/src/components/angular2-modal/overlay/overlay.service.ts
+++ b/src/components/angular2-modal/overlay/overlay.service.ts
@@ -39,11 +39,18 @@ export class Overlay {
     return _stack.indexOf(dialogRef);
   }
 
+  groupStackLength(dialogRef: DialogRef<any>): number {
+    return _stack.groupLength(_stack.groupOf(dialogRef));
+  }
+
 
   /**
-   * Opens a modal window inside an existing component.
+   * Creates an overlay and returns a dialog ref.
+   * @param config instructions how to create the overlay
+   * @param group A token to associate the new overlay with, used for reference (stacks usually)
+   * @returns {DialogRef<T>[]}
    */
-  open<T extends OverlayContext>(config: OverlayConfig): DialogRef<T>[] {
+  open<T extends OverlayContext>(config: OverlayConfig, group?: any): DialogRef<T>[] {
     let viewContainer = config.viewContainer,
         containers: Array<ViewContainerRef> = [];
 
@@ -62,12 +69,14 @@ export class Overlay {
       containers = [this.defaultViewContainer];
     }
 
-    return containers.map( vc => this.createOverlay(config.renderer || this._modalRenderer, vc, config));
+    return containers
+      .map( vc => this.createOverlay(config.renderer || this._modalRenderer, vc, config, group));
   }
 
   private createOverlay(renderer: OverlayRenderer,
                         vcRef: ViewContainerRef,
-                        config: OverlayConfig): DialogRef<any> {
+                        config: OverlayConfig,
+                        group: any): DialogRef<any> {
     if (config.context) {
       config.context.normalize();
     }
@@ -78,8 +87,7 @@ export class Overlay {
     let cmpRef = renderer.render(dialog, vcRef);
 
     Object.defineProperty(dialog, 'overlayRef', {value: cmpRef});
-    _stack.pushManaged(dialog);
-    dialog.onDestroy.subscribe(() => _stack.remove(dialog));
+    _stack.pushManaged(dialog, group);
 
     return dialog;
   }
diff --git a/src/components/angular2-modal/providers/modal.ts b/src/components/angular2-modal/providers/modal.ts
index f62b63ce..a7ec01d1 100644
--- a/src/components/angular2-modal/providers/modal.ts
+++ b/src/components/angular2-modal/providers/modal.ts
@@ -42,7 +42,7 @@ export abstract class Modal {
   open(componentType: any, config?: OverlayConfig): Promise<DialogRef<any>> {
     config = config || {} as any;
     try {
-      let dialogs = this.overlay.open(config);
+      let dialogs = this.overlay.open(config, this.constructor);
 
       if (dialogs.length > 1) {
         console.warn(`Attempt to open more then 1 overlay detected.