Add support for the RadRibbonBars to have their items merged while in MDI mode.
Add support for MDI list menu item.
Enable duplication of RadRibbonBar group's element.
add additional minimize options: - minimize to panel titles - minimize to panel buttons
This is the behavior for collapsing the ribbon and showing the the small image for RadButtonElement: https://docs.telerik.com/devtools/winforms/controls/ribbonbar/designing-radribbonbar/using-large-and-small-images
A similar functionality should be available for the ActionElement in RadDropDownButtonElement and RadSplitButtonElement.