Bug 121287 Post BIRT M3 build: Edit Group Dialog does not present expression builder for Group On
In Edit Group dialog, there is no expression builder for the Group On field. In order to support multi-pass aggregation, the expression builder is needed to specify an expression to group on.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
{
			intervalRange.setEnabled( false );
		}
		else
		{
			intervalRange.setSelection( inputGroup.getIntervalRange( ) );
		}
		if ( inputGroup instanceof TableGroupHandle )
		{
			includeHeader.setSelection( inputGroup.hasHeader( ) );
			includeFooter.setSelection( inputGroup.hasFooter( ) );
		}
		else
		{
			includeHeader.setSelection( false );
			includeFooter.setSelection( false );
		}
		if ( DesignChoiceConstants.SORT_DIRECTION_ASC.equals( inputGroup.getSortDirection( ) ) )
		{
			ascending.setSelection( true );
		}
		else
		{
			descending.setSelection( true );
		}
		List list = new ArrayList( 1 );
		list.add( inputGroup );
		
		tocEditor.setText( UIUtil.convertToGUIString( inputGroup.getTocExpression( ) ) );
		return true;