How can I call IValueConverter by user request? [XamDataGrid record index]?

Value conversion happens when the properties are accessed (get/set) via DataBinding. You're sorting is not triggering this and I don't suspect you want it to since your sort probably does not work on the original collection and you'd probably get the items with the wrong row index on them again. I don't know of anyway, other than explicitly triggering a binding refresh, of getting the ValueConverter implementation to work.

I found solution with help of Infragistics support. It's combines several methods. So...

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