eclipse FilteredTree

//org.eclipse.ui.dialogs.FilteredTree

public class XXXPage extends WizardPage {
  // gui
  private FilteredTree projectList;
  
  public void createControl(Composite parent) {
        
        // create the composite to hold the widgets
        Composite composite = new Composite(parent, SWT.NULL);
        
        // create the desired layout for this wizard page
        GridLayout layout = new GridLayout();
        layout.numColumns = MAX_COLUMN;
        composite.setLayout(layout);
        
        
        // create the list of bug reports
        projectList = new FilteredTree(composite, SWT.SINGLE | SWT.BORDER, new PatternFilter());
        //projectList.setLayoutData(GridDataFactory.swtDefaults().align(SWT.FILL, SWT.FILL).grab(true, true).hint(
        //        SWT.DEFAULT, 200).create());
        GridData gridData = new GridData(GridData.FILL_BOTH);
        gridData.widthHint = 80;
        gridData.heightHint = 160;
        gridData.verticalSpan = VERT_SPAN;

        projectList.setLayoutData(gridData);
        final TreeViewer projectViewer = projectList.getViewer();
        
        projectViewer.setLabelProvider(new LabelProvider());
        projectViewer.setContentProvider(new ITreeContentProvider() {

            public Object[] getChildren(Object parentElement) {
                //if (parentElement instanceof Collection) {
                //    return ((Collection<?>) parentElement).toArray();
                //}
                if(parentElement instanceof XXX){
                    ;
                    return node.getChildren().toArray();
                }
                return null;
            }

            public Object getParent(Object element) {
                if(element instanceof XXX){
                    
                    return node.getParent();
                }
                return null;
            }

            public boolean hasChildren(Object element) {
                if(element instanceof XXX){
                    
                    return (node.getChildren().size()>0);
                }
                return false;
            }

            public Object[] getElements(Object inputElement) {
                //return getChildren(inputElement);
                if(inputElement instanceof Collection  ){
                    return ((Collection<?>) inputElement).toArray();
                }
                return null;
            }

            public void dispose() {
            }

            public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
            }
        });

        projectViewer.addOpenListener(new IOpenListener() {
            public void open(OpenEvent event) {
                if (getWizard().canFinish()) {
                    if (getWizard().performFinish()) {
                        ((WizardDialog) getContainer()).close();
                    }
                }
            }
        });
        
        projectViewer.addPostSelectionChangedListener(new ISelectionChangedListener() {

            public void selectionChanged(SelectionChangedEvent event) {
                // Initialize a variable with the no error status
                Status status = new Status(IStatus.OK, DevTrackCorePlugin.PLUGIN_ID , 0, "", null);
                if (projectViewer.getSelection().isEmpty()) {
                                   
                }    
                // Show the most serious error
                applyToStatusLine(status);
                isPageComplete();
                
            }

        });
        
        
        
        // set the composite as the control for this page
        setControl(composite);
                
        isPageComplete();
    }

  

}