Bug 145520 Group name will not show up in group list if the group use default name and key expression has no value
Description: Group name will not show up in group list if key expression has no value. Steps to reproduce: 1. Insert a table into report, bind it to a data set 2. Switch to property editor -> groups 3. Click on add button to open new group dialog, then press ok button Expected result: A new group with default name will be added to group list Actual result: A new group is added to group list, but without group name. But when let group tab lost focus and get focus again, you can see the group name.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
if ( hasDescendents( oldElement, slotID ) )
		{
			throw new ContentException( oldElement, slotID,
					ContentException.DESIGN_EXCEPTION_HAS_DESCENDENTS );
		}
		
		ContentReplaceRecord replaceRecord = new TemplateTransformRecord(
				module, element, slotID, oldElement, newElement );
		ActivityStack stack = getActivityStack( );
		stack.startFilterEventTrans( replaceRecord.getLabel( ) );
		try
		{
			doDelectAction( oldElement, unresolveReference );
			
			TemplateCommand cmd = new TemplateCommand( module, element );
			cmd.checkAdd( newElement, slotID );
			
			stack.execute( replaceRecord );
			addElementNames( newElement );
		}
		catch ( ContentException e )
		{
			stack.rollback( );
			throw e;
		}
		catch ( NameException e )
		{
			stack.rollback( );
			throw e;
		}