@Override
public void createControl(Composite parent) {
    super.createControl(parent);
    viewer = getTreeViewer();
    contentProvider = new TreeNodeContentProvider();
    viewer.setContentProvider(contentProvider);
    labelProvider = new TextUMLLabelProvider();
    viewer.setLabelProvider(labelProvider);
    // disabled: used to make elements to show sorted by type
    // viewer.setComparator(new UIModelObjectViewerComparator());
    viewer.setAutoExpandLevel(AbstractTreeViewer.ALL_LEVELS);

    // tracks selections in the outline and reflects them in the editor
    viewer.addSelectionChangedListener(new ISelectionChangedListener() {
        public void selectionChanged(SelectionChangedEvent event) {
            TreeSelection selection = (TreeSelection) event.getSelection();
            if (!selection.isEmpty()) {
                TreeNode treeNode = (TreeNode) selection.getFirstElement();
                UIModelObject model = (UIModelObject) treeNode.getValue();
                selectInEditor(model.getToken());
            }
        }
    });

    refresh();
}
 

/**
 * @since 2.8
 */
protected void showBusyStatus() {
	TreeViewer treeViewer = getTreeViewer();
	treeViewer.setLabelProvider(busyLabelProvider);
	treeViewer.setContentProvider(new TreeNodeContentProvider());
	treeViewer.setInput(new TreeNode[] { new TreeNode("Loading...") });
}
 

public static ContainerCheckedTreeViewer createCheckedTreeViewer(final AbstractDialog dialog, final Composite parent, final int height, final int span) {
    final GridData gridData = new GridData();
    gridData.heightHint = height;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;
    gridData.horizontalSpan = span;

    final ContainerCheckedTreeViewer viewer = new ContainerCheckedTreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    final Tree tree = viewer.getTree();
    tree.setLayoutData(gridData);

    viewer.setContentProvider(new TreeNodeContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());

    if (dialog != null) {
        viewer.addCheckStateListener(new ICheckStateListener() {

            @Override
            public void checkStateChanged(final CheckStateChangedEvent event) {
                dialog.validate();
            }

        });
    }

    return viewer;
}
 

private void createAllObjectGroup(Composite composite) {
    final GridData gridData = new GridData();
    gridData.heightHint = 300;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;

    this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    final Tree tree = viewer.getTree();
    tree.setLayoutData(gridData);

    viewer.setContentProvider(new TreeNodeContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());
}
 

private void createAllSchemaGroup(Composite composite) {
    final GridData gridData = new GridData();
    gridData.heightHint = 300;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;

    this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    final Tree tree = viewer.getTree();
    tree.setLayoutData(gridData);

    viewer.setContentProvider(new TreeNodeContentProvider());
    viewer.setLabelProvider(new ViewLabelProvider());
}
 

private void createAllObjectGroup(Composite composite) {
	GridData gridData = new GridData();
	gridData.heightHint = 300;
	gridData.horizontalAlignment = GridData.FILL;
	gridData.grabExcessHorizontalSpace = true;

	this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI
			| SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
	Tree tree = this.viewer.getTree();
	tree.setLayoutData(gridData);

	this.viewer.setContentProvider(new TreeNodeContentProvider());
	this.viewer.setLabelProvider(new ViewLabelProvider());
}
 

private void createAllSchemaGroup(Composite composite) {
	GridData gridData = new GridData();
	gridData.heightHint = 300;
	gridData.horizontalAlignment = GridData.FILL;
	gridData.grabExcessHorizontalSpace = true;

	this.viewer = new ContainerCheckedTreeViewer(composite, SWT.MULTI
			| SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
	Tree tree = this.viewer.getTree();
	tree.setLayoutData(gridData);

	this.viewer.setContentProvider(new TreeNodeContentProvider());
	this.viewer.setLabelProvider(new ViewLabelProvider());
}