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 Handle start of a drag, it can set the data that should be transfered and should return a constant which dragndrop mode/modes is/are supported.
  
  Should return a DRAGNDROP constant or a combination of 2 constants:
  DRAGNDROP.MOVE if only a move can happen,
  DRAGNDROP.COPY if only a copy can happen,
  DRAGNDROP.MOVE|DRAGNDROP.COPY if a move or copy can happen,
  DRAGNDROP.NONE if nothing is supported (drag should not start).

onDrop

Handle a Event to handle the drop.
Return  Return true if drop has been performed successfully, otherwise false.you want the drop to continue, if you return false the element will move back where it started.This is a good place to save the position and size of the element.TODO:explain hidden properties used by mirus

onSelect

Every element that is selected will get this event, you can return true if you want the user to be able to select it, or false if you don't want that the users uses that element in clientDesign mode. It is better practice to set your element not selectable with the client design properties before you go into clientDesign mode because then the element is really not selectable and if you use this method you could see a second of selection. 

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