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
{
			DimensionViewHandle viewHandle = crosstab.getDimension( ICrosstabConstants.COLUMN_AXIS_TYPE,
					i );
			if ( isAvaliableTimeDimension( viewHandle.getCubeDimension( ) ) )
			{
				
				
				
				
				return viewHandle.getCubeDimension( ).getName( );
			}
		}
		count = crosstab.getDimensionCount( ICrosstabConstants.ROW_AXIS_TYPE );
		for ( int i = 0; i < count; i++ )
		{
			DimensionViewHandle viewHandle = crosstab.getDimension( ICrosstabConstants.ROW_AXIS_TYPE,
					i );
			if ( isAvaliableTimeDimension( viewHandle.getCubeDimension( ) ) )
			{
				
				
				
				
				return viewHandle.getCubeDimension( ).getName( );
			}
		}
		return null;
	}
	private boolean isAvaliableTimeDimension( DimensionHandle dimension )
	{