How to call CV Extender BR in Cube view?

Happy Monday Y'all,

How do I call a cube view extender BR in a cube view. I'm using it to increase the report sub-header font. I'm using a code that was described in OneStream XF manual. 

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Here is the code:

Select Case args.FunctionType
Case Is = CVExtenderFunctionType.FormatReportUIItem
	Dim uiItem As CVExtenderReportUIItem = args.Report.CurrentUIItem
	If uiItem.UIItemType = XFReportUIItemType.PageHeaderLabelCenter1 Then
		uiItem.FontSize = 14
		uiItem.Bold = True
	End If
End Select

Thank you,

Mustafa A