I have xamgrid which gets populated based on the selection of value in combo 

This works fine

It updates data correctly

I have add row functionality which adds new row to the xamgrid

Combo is populated using TableX (ID FieldX)

XamGrid is populated with TableY (ID , Field1, FieldXX) FiledXX is nothing but TableX.FieldX

When it updates it has the record so it knows it has to update the record based on FieldX value

But when i add it just shows that value as null

Is there a way that the xamgrid recognises the value entered in combo and populates that value when new row is added