public class TestOutlinePage extends ContentOutlinePage {

	private TreeViewer treeViewer;

	public void createControl(Composite parent) {

		PatternFilter filter = new PatternFilter();
		FilteredTree tree = new FilteredTree(parent, SWT.MULTI | SWT.H_SCROLL
				| SWT.V_SCROLL, filter, false);
		treeViewer = tree.getViewer();
		// treeViewr = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);

		treeViewer.addSelectionChangedListener(this);
		treeViewer.setInput(Input);
		... 

	}

	@Override
	protected TreeViewer getTreeViewer() {
		return treeViewer;
	}

	@Override
	public Control getControl() {
		if (treeViewer == null) {
			return null;
		}
		return treeViewer.getControl();
	}

	@Override
	public ISelection getSelection() {
		if (treeViewer == null) {
			return StructuredSelection.EMPTY;
		}
		return treeViewer.getSelection();
	}
    
	@Override
	public void setFocus() {
 		treeViewer.getControl().setFocus();
	}
	
	@Override
	public void setSelection(ISelection selection) {
		if (treeViewer != null) {
			treeViewer.setSelection(selection);
		}
	}
}