why are you setting the function on the doOnRender??? I used this as a
suggestion I have researched.  This works when I ran the sample in GWT-EXT
demo for grid with checkbox column
http://www.gwt-ext.com/demo/#checkboxSelectionGrid
see below code

        grid.doOnRender(new Function() { //added by alz 01-08-2010
          public void execute() {
          cbSelectionModel.selectAll();
                System.out.println("\n -->>You enter here doOnRender" );
               }
               });
        //grid.doLayout();
        panel.add(grid);
        panel.add(button);

        RootPanel.get().add(panel);
    }

//===============================================

The scenario is for every category there is a definite set of products to
choose from such
as (example only)

CategoryA -- productA1
                    productA2
                    productA3
                    productA4
                    ...

 CategoryB -- productB1
                    productB2
                    productB3
                    productB4
                    ...

 CategoryC -- productC1
                    productC2
                    productC3
                    productC4
                    ...



 CategoryD -- productD1
                    productD2
                    productD3
                    productD4
                    ...

The categories are placed in a tree as nodes.

When a particular node is checked, the corresponding set of products is
loaded in a grid and as default checked all.
Then the user can change by manually clicking the checkboxes of every
product or the select all check box in the colum header.
So when the check event for the node  is triggerred the grids' rows'
checkboxes should all be checked.

I hope this is clear.

-Lanz
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