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
.getCubeDimension( )
					.getName( )
					.equals( dimensionName ) )
			{
				inUseDimsion = true;
			}
		}
		return inUseDimsion;
	}
	private void initCalculationTypeCombo( String dimensionName )
	{
		CubeHandle cube = getCrosstabReportItemHandle( ).getCube( );
		if (cube == null)
		{
			return;
		}
		DimensionHandle handle = cube.getDimension( dimensionName );
		String cal = calculationType.getText( );
		isStatic = true;
		if ( recentButton.getSelection( ) )
		{
			isStatic = false;
		}
		times = TimeFunctionManager.getCalculationTypes( handle,
				getUseLevels( dimensionName ),
				isStatic );
		String[] items = new String[times.size( )];
		String[] names = new String[times.size( )];
		for ( int i = 0; i < times.size( ); i++ )
		{