Action handlers
	
	
			
	
	
	
		Selected node ID will be passed to function specified as argument for setDefaultAction(funcObj)
		Dropped node ID and new parent node ID  will be passed to function specified as argument for setDragFunction(funcObj)
		node ID will be passed to the function specified as argument for setOpenAction(aFunc)
		node ID will be passed to the function specified as argument for setDblClickAction(aFunc)