Bug 390669 [Accessibility]Press 'Tab' doesn't focus on the next report item when adding relative period aggregation.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
validate( );
			}
			public void widgetSelected( SelectionEvent arg0 )
			{
				handleCalculationSelectEvent( );
				modifyDialogContent( );
				validate( );
			}
		} );
	}
	private void handleCalculationSelectEvent( )
	{
		Control[] children = calculationComposite.getChildren( );
		for ( int i = 2; i < children.length; i++ )
		{
			children[i].dispose( );
		}
		ITimeFunction function = getTimeFunctionByIndex( calculationType.getSelectionIndex( ) );
		if ( function == null )
		{
			
			
			
			
			
		}
		else
		{
			calculationParamsMap.clear( );
			List<IArgumentInfo> infos = function.getArguments( );