Bug 124430 [Smoke][Regression][RCP]Library explorer keep gray even you add library file in Preferences.
Description: Library explorer keep gray even you add library file in Preferences. Steps to reproduce: 1. New several library files and add them through Window-->Preferences menu. 2. New a report and open Library Explorer view. Expected result: Library files display inside it. Actual result: It is gray with nothing inside. I cannot find add button in Library Explorer to add a library file,either.
UI/org.eclipse.birt.report.designer.ui.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerView.java
* call to <code>doDestroyPage</code>.
	 * 
	 * @param part
	 *            the input part
	 * @return the record describing a new page for this view
	 * @see #doDestroyPage
	 */
	protected PageRec doCreatePage( IWorkbenchPart part )
	{
		if ( part instanceof AbstractMultiPageLayoutEditor )
		{
			IEditorPart editor = UIUtil.getActiveEditor( true );
			if ( editor != null )
			{
				Object fileAdapter = editor.getEditorInput( )
						.getAdapter( IFile.class );
				if ( fileAdapter != null )
				{
					LibraryExplorerTreeViewPage page = getPage( fileAdapter,
							editor );
					initPage( page );
					page.createControl( getPageBook( ) );
					return new PageRec( part, page );
				}
			}
		}
		return null;
	}
	private LibraryExplorerTreeViewPage getPage( Object fileAdapter,
			IEditorPart editor )