QmlDesigner has no way to edit the menubar of Qt Quick 2 UI with Controls

Steps to reproduce:

• open/create a Qt Quick 2 UI with Controls
• switch to Designer view

Current behaviour:

• inside Navigator there are statusbar and toolbar displayed (although there not part of the example code) but menubar is not listed (although it's part of the code)

Expected behaviour:

• menubar should be listed as element inside the Navigator as well
• maybe a way to edit the menu entries