Pressing Tab key does not focus child widgets in ModalDialog

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GWT version: 1.3.3
GWT Tk version: 0.2.2
Browsers tested: IE 6, hosted mode
Browsers affected: ?

I've implemented a LoginDialog using the great GWT Tk lib. Unfortunately 
my login input fields focus cycle seems to be broken - the tab key is not 
working inside the dialog. I tested the focus in the multiple-dialog demo 
to doublecheck if this is a general issue but (after a first try that 
didn't work for some reason) it worked perfect.
Is there something obvious that I'm missing?

Original issue reported on code.google.com by [email protected] on 9 May 2007 at 10:36