Hello Stoyo,

for a single node select & drag we have 3 events that give feedback:

NodeStartModifying += myNodeStartModifying; //begin-once = begin of node drag
NodeModifying += myNodeValidation; //ongoing-repeated = during the node drag around
NodeModified += myNodeModified; //end-once = end of drag action

(these can also be used for stretching of a node, too)

...

but to detect the similar three phases of a Selection drag, i found only:

SelectionMoving += mySelectionMoving; //ongoing-repeated = during the selection drag around
SelectionMoved += mySelectionMoved; //end-once = end of drag action

===
but i was unable to identify an event that fires on the begin of a selection drag?

Would need it to tidy up some other stuff at that instant, please?