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
try
		{
			CrosstabReportItemHandle xtabHandle = (CrosstabReportItemHandle) ( (ExtendedItemHandle) getBindingHolder( ) ).getReportItem( );
			try
			{
				IBinding[] aggregateBindings = CubeQueryUtil.getAggregationBindings( getCrosstabBindings( xtabHandle ) );
				for ( IBinding binding : aggregateBindings )
				{
					if ( getBinding( ) == null
							|| !getBinding( ).getName( )
									.equals( binding.getBindingName( ) ) )
						datas.add( ExpressionUtil.createJSDataExpression( binding.getBindingName( ) ) );
				}
			}
			catch ( AdapterException e )
			{
			}
			catch ( BirtException e )
			{
			}
		}
		catch ( ExtendedElementException e )
		{
		}
		return datas;
	}
	private IBinding[] getCrosstabBindings( CrosstabReportItemHandle xtabHandle )
			throws BirtException
	{
		Iterator bindingItr = ( (ExtendedItemHandle) xtabHandle.getModelHandle( ) ).columnBindingsIterator( );