Bug 154814 Use library, add library, delete library selection can't be found on Library right click menu in Library explorer
Details: Use library, add library, delete library selection can't be found on Library right click menu in Library explorer Step: 1.New a library and publish to resource folder. 2.New a report design and open library explorer. 3.Right click on the library in library explorer to use the library. Actual result: The selection of use, add ,delete library cannot be found. Exception result: Do can use the right click menu to use, add, delete library.
UI/org.eclipse.birt.report.designer.ui.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerTreeViewPage.java
import org.osgi.service.prefs.BackingStoreException;
/**
 * This class represents the tree view page of the data view
 * 
 */
public class LibraryExplorerTreeViewPage extends LibraryExplorerViewPage
		implements
			IValidationListener,
			IPreferenceChangeListener,
			IResourceChangeListener
{
	
	
	private IEclipsePreferences reportPreferenceNode;
	private TreeViewer treeViewer;
	/**
	 * Creates the tree view
	 * 
	 * @param parent
	 *            the parent
	 */
	protected TreeViewer createTreeViewer( Composite parent )
	{
		treeViewer = new TreeViewer( parent, SWT.MULTI | SWT.H_SCROLL
				| SWT.V_SCROLL );
		configTreeViewer( );
		initPage( );
		return treeViewer;
	}
	/**