Widget inside of another widget

Is it possible or planned to implement to insert one widget inside of another? I've created my own widget, but the editor doesnot insert other widgets inside of it. The widget buttons are enabled, however nothing happens when I click them.

If I insert another widget directly in the HTML code, the editor displays it, but does not allow to modify the container widget.

I am using CKEditor 4.3.1. The container widget is similar to the "Simple Sample Box" widget with removed 'allowedContent' to allow all tags.