Hi Chris,
You need to use the DBCLICK() Event of the textbox (i.e Grid.Column1.Text1.DBLCLICK()
From there call Grids DBLCLICK() AS
PROECDURE Grid.Column1.Text1.DBLCLICK()
THIS.PARENT.PARENT.DBLCLICK()
ENDPROC
Add Code in grids DBLCLICK() event as necessary.
Mention that Grids DBLCLICK() will fire if you double click a GridLine.