Me.Form.DefaultButton = btnUpdate.UniqueID - Is there any other way to do this (issues with updatePanels)

I was using Me.Form.DefaultButton = btnUpdate.UniqueID
To set the default button which was inside a gridView as the UPDATE command for when a row is being edited.
It worked great, so that after EDIT was clicked it would default to the UPDATE button so the user just had to press ENTER.
However, the form is on the master page and my gridView was in a content page.  That was fine, UNTIL I put my gridView in an updatePanel.
Now the gridView works just fine, but since it updates inside the updatePanel and the form is on the Master Page outside said panel, the default button never gets changed.
How else could I assign the default button so it changes inside the updatePanel instead of needing the entire page to postback and refresh to update the ...