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
String name ) throws SemanticException
	{
		ComputedColumn column = StructureFactory.newComputedColumn( bindingHolder,
				name == null ? txtName.getText( ) : name );
		ComputedColumnHandle binding = DEUtil.addColumn( bindingHolder,
				column,
				true );
		return editBinding( binding );
	}
	public void setContainer( Object container )
	{
		this.container = container;
	}
	public boolean canProcessAggregation( )
	{
		return true;
	}
	private URL[] getAvailableResourceUrls( )
	{
		List<URL> urls = new ArrayList<URL>( );
		String[] baseNames = getBaseNames( );
		if ( baseNames == null )
			return urls.toArray( new URL[0] );
		else
		{
			for ( int i = 0; i < baseNames.length; i++ )
			{
				URL url = SessionHandleAdapter.getInstance( )
						.getReportDesignHandle( )
						.findResource( baseNames[i],