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
*            the design element
	 * @param ev
	 *            the notification event
	 */
	public void elementChanged( DesignElementHandle focus, NotificationEvent ev )
	{
		if ( focus instanceof DataSetHandle )
		{
			if ( !( ev instanceof ElementDeletedEvent ) )
			{
				if ( !dataSetsToRefresh.contains( focus ) )
					dataSetsToRefresh.add( focus );
			}
			else
			{
				if ( dataSetsToRefresh.contains( focus ) )
					dataSetsToRefresh.remove( focus );
			}
		}
		else if ( focus instanceof ModuleHandle
				&& ev.getEventType( ) == NotificationEvent.CONTENT_EVENT )
		{
			IDesignElement element = ( (ContentEvent) ev ).getContent( );
			if ( ( (ContentEvent) ev ).getAction( ) == ContentEvent.REMOVE
					&& element.getDefn( )
							.getName( )
							.equals( ReportDesignConstants.ODA_DATA_SET ) )
			{
				DataSetManager.getCurrentInstance( )
						.removeCachedColumns( element.getHandle( SessionHandleAdapter.getInstance( )