This is the discussion forum for the HtmlEditor. See also the HtmlEditor home page, where you can download the control, and the Documentation Wiki, a collaborative project for documenting the control.
You can use as:
ed.iEvent.ondrop-=new HTMLTextContainerEvents2_ondropEventHandler(ed.iEvent_ondrop);.....
to remove the eventHandler when drop is completed.
when you do drag-drop than add these event.