Bug 128317 group header and footer checkboxes
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
inputGroup.setInterval( intervalChoices[index].getName( ) );
			if ( index != 0 )
			{
				inputGroup.setIntervalRange( intervalRange.getSelection( ) );
			}
			else
			{
				inputGroup.setProperty( GroupHandle.INTERVAL_RANGE_PROP, null );
			}
			if ( intervalBaseText.getEnabled( ) )
			{
				inputGroup.setIntervalBase( UIUtil.convertToModelString( intervalBaseText.getText( ),
						false ) );
			}
			else
			{
				inputGroup.setIntervalBase( null );
			}
			inputGroup.setHideDetail( hideDetail.getSelection( ) );
			if ( inputGroup instanceof TableGroupHandle )
			{
				if ( includeHeader.getSelection( ) != inputGroup.hasHeader( ) )
				{
					if ( includeHeader.getSelection( ) )
					{
						inputGroup.getHeader( ).add( createRow( ) );
					}
					else
					{
						inputGroup.clearContents( GroupHandle.HEADER_SLOT );