Bug 123404 Pre-define style shouldn't be listed in the style list
Description: Pre-define style shouldn't be listed in the style list Steps to reproduce: 1.Add a label 2.New a pre-define style named "label", set font color to red 3.New a text, select it Expected result: The pre-define style can't apply to the text through any way Actual result: In property editor or properties sheet, the style list lists the pre-define style, and it can be applied to the text Note: In context menu, pre-define style is invisible for the text
UI/org.eclipse.birt.report.designer.ui.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerTreeViewPage.java
* 
	 * @see org.eclipse.birt.report.model.activity.ActivityStackListener#stackChanged(org.eclipse.birt.report.model.activity.ActivityStackEvent)
	 */
	public void stackChanged( ActivityStackEvent event )
	{
		if ( !dataSetsToRefresh.isEmpty( ) )
		{
			PlatformUI.getWorkbench( )
					.getDisplay( )
					.asyncExec( new Runnable( ) {
						public void run( )
						{
							if ( !isDisposed( ) )
							{
								for ( int i = 0; i < dataSetsToRefresh.size( ); i++ )
								{
									DataSetHandle dataSetToRefresh = (DataSetHandle) dataSetsToRefresh.get( i );
									DataSetManager.getCurrentInstance( )
											.refresh( dataSetToRefresh );
									treeViewer.refresh( dataSetToRefresh );
								}
								dataSetsToRefresh.clear( );
							}
						}
					} );
		}
	}
	protected boolean isDisposed( )
	{
		Control ctrl = getControl( );