Menu opened with Menubutton sticks

[Driolar]

1. Run the method #exampleWithinMenuButton in class SpMenuItemPresenter
2. Open the menu
3. Click with the mouse somewhere around the menu

--> the menu sticks permanently
You can only make the menu disappear by clicking an option.
Clicking on the button or somewhere else around the displayed menu doesn't remove the menu.
Eventually, a runtime error repeats.

See also the following screenshots: