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
recentButton.setEnabled( true );
		}
		else
		{
			recentButton.setEnabled( false );
		}
	}
	private boolean isUseDimension( String dimensionName )
	{
		boolean inUseDimsion = false;
		CrosstabReportItemHandle crosstab = getCrosstabReportItemHandle( );
		if(crosstab.getCube() == null)
		{
			return false;
		}
		int count = crosstab.getDimensionCount( ICrosstabConstants.COLUMN_AXIS_TYPE );
		for ( int i = 0; i < count; i++ )
		{
			if ( crosstab.getDimension( ICrosstabConstants.COLUMN_AXIS_TYPE, i )
					.getCubeDimension( )
					.getName( )
					.equals( dimensionName ) )
			{
				inUseDimsion = true;
			}
		}
		count = crosstab.getDimensionCount( ICrosstabConstants.ROW_AXIS_TYPE );
		for ( int i = 0; i < count; i++ )
		{
			if ( crosstab.getDimension( ICrosstabConstants.ROW_AXIS_TYPE, i )