doMove( content, fromSlotID, to, toSlotID, -1 );
assert newPos >= 0; doMove( content, fromSlotID, to, toSlotID, newPos );
	public void move( DesignElement content, int fromSlotID, DesignElement to,			int toSlotID ) throws ContentException	{		doMove( content, fromSlotID, to, toSlotID, -1 );	}