Hi Wilfried, unfortunately such behavior is not currently possible.
Yes, I understand not in the current implementation. But do you think it is doable by adapting the current code?
Will it work still with TCategoryButtons solution for the block libraries? or better use something else? After all: in the Delphi IDE it works as we like when dragging components from the component palette.
It would need changing TMS Diagram Studio source code. It has to be investigated, it's not trivial as there is a need to handle the mouse move, the block position, etc.. It cannot be done without changing the component source code itself, unfortunately.