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
ExpressionButtonUtil.getExpression( txtFilter ) ) )
				return true;
			if ( !strEquals( cmbAggOn.getText( ),
					DEUtil.getAggregateOn( binding ) ) )
				return true;
			IAggrFunction function = getFunctionByDisplayName( cmbFunction.getText( ) );
			if ( function != null )
			{
				IParameterDefn[] params = function.getParameterDefn( );
				for ( final IParameterDefn param : params )
				{
					if ( paramsMap.containsKey( param.getName( ) ) )
					{
						Expression paramValue = ExpressionButtonUtil.getExpression( paramsMap.get( param.getName( ) ) );
						for ( Iterator iterator = binding.argumentsIterator( ); iterator.hasNext( ); )
						{
							AggregationArgumentHandle handle = (AggregationArgumentHandle) iterator.next( );
							if ( param.getName( ).equals( handle.getName( ) )
									&& !exprEquals( (Expression) handle.getExpressionProperty( AggregationArgument.VALUE_MEMBER )
											.getValue( ),
											paramValue ) )
							{
								return true;
							}
						}
						if ( param.isDataField( )
								&& binding.getExpression( ) != null
								&& !exprEquals( (Expression) binding.getExpressionProperty( ComputedColumn.EXPRESSION_MEMBER )
										.getValue( ),
										paramValue ) )