GridContainer - focus problem when contains non-toggleable TitlePane

[ds]

In both IE7 and IE8, when a GridContainer? contains a TitlePane? with attribute toggleable="false", if you click on the TitlePane?'s titlebar and then press a key (e.g., a, Shift, etc.) you get the following error:

Error: 'parentNode' is null or not an object

This appears to be coming from GridContainer?._selectFocus() line 899:

if(focusNode.parentNode.parentNode == this.gridNode){

because focusNode is null.

This can be reproduced with the test page at dojox/layout/tests/test_GridContainer.html:
1) Modify any dijit.TitlePane? in the GridContainer? (e.g., the one with title="Ergo") to add the attribute toggleable="false".
2) View the page in IE 7 or IE 8.
3) Click on the titlebar of the non-toggleable TitlePane?.
4) Press a key on the keyboard.
At that point you should see the javascript error in IE.

[dylan]

Given the lack of activity on this, I'm closing it for now. We would welcome a patch.