Window (CList) update semantics

Can anyone tell me how to get a CList row to update immediately
when I change a cell with set_text()? I'm changing a cell inside
a handler with:

        $widget-> freeze;
        $widget-> set_text ("NEW CELL CONTENTS");
        $widget-> thaw;

The window doesn't update until the handler returns. 

I've got a process that takes some time (seconds to minutes),
started by a button, and I need to update a cell during this
extended process.

Any hints appreciated. It seems outside the scope of the GTK
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