Force liststore to update when leaving treeview

[Mike Martin <redtux1 gmail com>]

Is this possible?

I have a (for example) a grid which contains
Various action widgets
And a Treeview based on a liststore

Is there any way to make sure that the changes made to a cell in the
liststore are "committed" if I click on one of the other widgets

I cant find anything to do this and if I leave the cell without pressing
enter or clicking on another cell, all changes are lost

thanks

Mike