Ultrawebgrid , a template column (dropdownlist) values get refreshed on click of another template column image button

I am having a dropdownlist as a template column in Infragistics webgrid which is bind to a collection on page load.

I have another template column in the same grid which is image button. On click of Image button a new row is added to the ultrawebgrid but the entire dropdownlist for column 1 is refreshed. I am writing the code in VB.net and not using any javascript. How to avoid the refresh of dropdownlist in ultrawebgrid on adding a new row ?

I am writing the code to add new row in

Protected Sub UltraWebGrid1_ItemCommand(ByVal sender As Object, _
ByVal e As UltraWebGridCommandEventArgs) Handles UltraWebGrid1.ItemCommand
UltraWebGrid1.Rows.Add()
End Sub
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