diff --git a/src/lib/menu/menu-adapter.ts b/src/lib/menu/menu-adapter.ts
index 0497adb78..59eb89c95 100644
--- a/src/lib/menu/menu-adapter.ts
+++ b/src/lib/menu/menu-adapter.ts
@@ -1,7 +1,7 @@
 import { BaseAdapter, IBaseAdapter } from '../core/base/base-adapter';
 import { IMenuOption } from './index';
 import { IMenuComponent } from './menu';
-import { MENU_CONSTANTS, IMenuSelectEventData } from './menu-constants';
+import { MENU_CONSTANTS, IMenuSelectEventData, IMenuOptionGroup } from './menu-constants';
 import { IListDropdownConfig, IListDropdown, ListDropdown } from '../list-dropdown';
 import { IListComponent, IListItemComponent, LIST_CONSTANTS, LIST_ITEM_CONSTANTS } from '../list';
 
@@ -14,7 +14,7 @@ export interface IMenuAdapter extends IBaseAdapter {
   removeTargetListener(event: string, callback: (event: Event) => void): void;
   attachMenu(config: IListDropdownConfig): void;
   detachMenu(): void;
-  setOptions(options: IMenuOption[]): void;
+  setOptions(options: Array<IMenuOption | IMenuOptionGroup>): void;
   getActiveOptionIndex(): number;
   setActiveOption(index: number): void;
   activateFirstOption(): void;
@@ -93,7 +93,7 @@ export class MenuAdapter extends BaseAdapter<IMenuComponent> implements IMenuAda
     this._targetElement.setAttribute('aria-controls', `list-dropdown-popup-${config.id}`);
   }
 
-  public setOptions(options: IMenuOption[]): void {
+  public setOptions(options: Array<IMenuOption | IMenuOptionGroup>): void {
     if (this._listDropdown) {
       this._listDropdown.setOptions(options);
     }
diff --git a/src/lib/menu/menu-constants.ts b/src/lib/menu/menu-constants.ts
index 320f32a74..6b4244ef0 100644
--- a/src/lib/menu/menu-constants.ts
+++ b/src/lib/menu/menu-constants.ts
@@ -68,5 +68,5 @@ export interface IMenuOption<T = any> extends IListDropdownOption<T> {
 export interface IMenuOptionGroup extends IListDropdownOptionGroup {}
 
 export type MenuOptionBuilder = (option: IMenuOption, parentElement: HTMLElement) => HTMLElement | string | void;
-export type MenuOptionFactory = (() => IMenuOption[]) | (() => Promise<IMenuOption[]>);
+export type MenuOptionFactory = (() => Array<IMenuOption | IMenuOptionGroup>) | (() => Promise<Array<IMenuOption | IMenuOptionGroup>>);
 export type MenuMode = 'click' | 'cascade';
diff --git a/src/lib/menu/menu-foundation.ts b/src/lib/menu/menu-foundation.ts
index ae5ad4cd4..74c4c139a 100644
--- a/src/lib/menu/menu-foundation.ts
+++ b/src/lib/menu/menu-foundation.ts
@@ -126,10 +126,17 @@ export class MenuFoundation extends CascadingListDropdownAwareFoundation<IMenuOp
   }
 
   private get _flatOptions(): IMenuOption[] {
-    if (isListDropdownOptionType(this._options, ListDropdownOptionType.Group)) {
-      return (this._options as IMenuOptionGroup[]).reduce((previousValue, currentValue) => previousValue.concat(currentValue.options), [] as IMenuOption[]) as IMenuOption[];
+    return this._flattenOptions(this._options);
+  }
+
+  private _flattenOptions(options: Array<IMenuOption | IMenuOptionGroup>): IMenuOption[] {
+    if (isListDropdownOptionType(options, ListDropdownOptionType.Group)) {
+      return (options as IMenuOptionGroup[])
+        .reduce((previousValue, currentValue) => {
+          return currentValue.options ? previousValue.concat(currentValue.options) : previousValue;
+        }, [] as IMenuOption[]);
     }
-    return this._options as IMenuOption[];
+    return options as IMenuOption[];
   }
 
   private _onTargetClick(evt: MouseEvent): void {
@@ -348,7 +355,8 @@ export class MenuFoundation extends CascadingListDropdownAwareFoundation<IMenuOp
     return Promise.resolve(this._optionsFactory())
       .then(results => {
         if (!this._persistSelection) {
-          results.forEach(o => o.selected = false);
+          const flatResults = this._flattenOptions(results);
+          flatResults.filter(o => o.selected).forEach(o => o.selected = false);
         }
 
         if (this._open) {