if ( param instanceof ScalarParameterHandle )
if ( param != selectedParameter )
			public void selectionChanged( SelectionChangedEvent event )			{				ISelection selection = event.getSelection( );				Object param = ( (StructuredSelection) selection ).getFirstElement( );				if ( param instanceof ScalarParameterHandle )				{					selectedParameter = (ScalarParameterHandle) param;					refreshParameterProperties( );					// valueTable.refresh( );					updateButtons( );				}			}