@Override
	public void createPartControl(Composite parent) {
		
		//viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
		FilteredTree filteredTree = new FilteredTree(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL, new PatternFilter(), true, true);
		viewer = filteredTree.getViewer();

		drillDownAdapter = new DrillDownAdapter(viewer);
		
	    int ops = DND.DROP_COPY | DND.DROP_MOVE;
	    Transfer[] transfers = new Transfer[] { TextTransfer.getInstance()};
	    viewer.addDragSupport(ops, transfers, new DragSourceAdapter());		
				
		viewer.setContentProvider(new ViewContentProvider());
		viewer.setInput(getViewSite());
		viewer.setLabelProvider(new ViewLabelProvider());