Use ContextMenu instead of DropDown menu on regenerate / retry button

I guess to make this kind of decision, you probably would want to get data on how people use it, but I personally use regenerate/retry more often for the same model than to choose different model and do click and then another click on same model is annoying.

I wish default behavior would be regenerate with same, but if you open context menu with right mouse click or by long touch on sensor display then it opens the model menu.