wow it works ! you sir are a genius !!!
i wouldnt ever have found the “on drag over” overide function myself !
thx very very much
if i may be so unpolite and ask one further question (else it may again take me days to find or find not the solution for 
)
now that i have the mouse coordinates while dragging (Yeeeeehaaa !! ) , how can i find out which object in my scene is under exactly these coordinates while dragging and if dragging has ended
kind regards
stucki