Bug 128317 group header and footer checkboxes
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
{
		intervalType.removeAll( );
		for ( int i = 0; i < choice.length; i++ )
		{
			intervalType.add( choice[i].getDisplayName( ) );
		}
		intervalType.setData( choice );
		intervalType.select( 0 );
		intervalType.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				intervalRange.setEnabled( intervalType.getSelectionIndex( ) != 0 );
				intervalBaseButton.setEnabled( intervalType.getSelectionIndex( ) != 0
						&& ( getColumnType( ) != String.class ) );
				intervalBaseText.setEnabled( intervalBaseButton.getEnabled( )
						&& intervalBaseButton.getSelection( ) );
			}
		} );
		enableIntervalRangeAndBase( false );
	}
	/**
	 * Enable the interval range and base right after refreshing the interval
	 * type
	 * 
	 */
	private void enableIntervalRangeAndBase( boolean bool )
	{
		intervalRange.setEnabled( bool );
		intervalBaseButton.setEnabled( bool );
		intervalBaseText.setEnabled( bool );