When expand the list of toolbars in the “main” or “sidebar” and select one, then the commands are executed correctly
But if select any button on toolbar (float to top mode) without opening the entire list of panel, then on the right mouse button will _DupBorder. This command is always assigned to all buttons!
When enabled “float to top” in other panels with toolbars, right mouse button does not nothing action.
This problem was not in R4
Also this bug with right mouse button are present in the "MRU Tool Bar Button Sidebar"
How to add buttons to the this panel? There now only 20 buttons