case OS.NM_DBLCLK: {
			/*
			* When the user double clicks on a tree item
			* or a line beside the item, the window proc
			* for the tree collapses or expand the branch.
			* When application code associates an action
			* with double clicking, then the tree expand
			* is unexpected and unwanted.  The fix is to
			* avoid the operation by testing to see whether
			* the mouse was inside a tree item.
			*/
			if (hooks (SWT.MeasureItem)) return LRESULT.ONE;

	
		treeViewer.getControl().addListener(SWT.MeasureItem, new Listener(){
			@Override
			public void handleEvent(Event event) {
				
			}});