When you first asked the earlier question about a -window itemtype in a TixGrid, I somehow knew that a problem was coming. :-) I got that weird tingle up my spine.

The TixGrid widget is considered somewhat experimental, so you probably should switch to a more widely used and tested widget, like maybe Tk::TableMatrix.

From the perldoc for Tk::TixGrid

<quote> The port of Tix C code and some of the bindings to perl/Tk is done but still need further work. In several places the intent of the Tix code is not yet understood. For example the ’edit’ interface is clearly intended for spread‐sheet like cell content editing in an auxillary "entry" widget or similar, but how that should work is not yet clear. </quote>