A CustomViewAction is a MenuAction that contains a View instead of an icon or text. This enables embedding of interactive components to a Menu or ToolBar.
Create a new CustomViewAction
| view | 
 A View.  | 
| function | 
 A Function to execute when this item is selected. NOTE: In some cases, the View that the CustomViewAction contains will absorb mouse clicks, making it difficult to select this menu item (and thus trigger the action).  | 
Set the View that is attached to this CustomViewAction.
| v | 
 A View.  |