I'm using 2015.01.401 of your controls.
I'm trying to do a template column and your demo at http://demos.telerik.com/aspnet-ajax/pivotgrid/examples/templates/defaultvb.aspx?show-source=true
has several calls in the pivotgrid templates, to GetDataItem()
However, that doesn't appear to be a built-in method and you don't define that in the page or code-behind.
Where is it?