Bug 229084 [About] up/down buttons don't enable for About->Plug-in Details->Columns
The Columns dialog in About->Plug-in Details->Columns has an up and a down button. They don't enable when a list item is selected.
bundles/org.eclipse.jface/src/org/eclipse/jface/internal/ConfigureColumnsDialog.java
* @param tree
	 */
	public ConfigureColumnsDialog(IShellProvider shellProvider,
			Tree tree) {
		this(shellProvider, (Control)tree);
	}
	
	/**
	 * @param shellProvider
	 * @param control
	 */
	private ConfigureColumnsDialog(IShellProvider shellProvider,
			Control control) {
		super(shellProvider);
		this.targetControl = control;
		createColumnObjects();
	}
	
	protected boolean isResizable() {
		return true;
	}
	public void create() {
		super.create();
		getShell().setText(
				JFaceResources.getString("ConfigureColumnsDialog_Title")); 
	}
	/**
	 * 
	 */
	private void createColumnObjects() {