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
{
			return null;
		}
		return times.get( index );
	}
	private ITimeFunction getTimeFunctionByDisplaName( String name )
	{
		if ( times == null )
		{
			return null;
		}
		for ( int i = 0; i < times.size( ); i++ )
		{
			if ( times.get( i ).getName( ).equals( name ) )
			{
				return times.get( i );
			}
		}
		return null;
	}
	private void openKeySelectionDialog( )
	{
		ResourceEditDialog dlg = new ResourceEditDialog( composite.getShell( ),
				Messages.getString( "ResourceKeyDescriptor.title.SelectKey" ) ); 
		dlg.setResourceURLs( getResourceURLs( ) );
		if ( dlg.open( ) == Window.OK )
		{
			String[] result = (String[]) dlg.getDetailResult( );
			txtDisplayNameID.setText( result[0] );
			txtDisplayName.setText( result[1] );