I find it desirable to have the UI engine run, in debug mode and only optionally in release mode, a duplicate check on keyboard accelerators on controls (like labels or command buttons, as in __Quit being rendered as Quit and enabling the user to press [Alt]+[Q]). All too often, on bigger panels, when adding a feature, I find that a shortcut/accelerator is already assigned.
Note that the UI editor per se isn't sufficient while controls can be added programmatically.
