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Disabling text input on FilteringSelect or ComboBox form dijits

Hello All,
I'm trying to disable the text input part of a FilteringSelect control but I haven't had any luck. I've tried using "readOnly" and "disabled", but as expected, they have a global effect on the widget, not just on the TextBox portion.
I've also looked around in the forum, but I've had no luck.
Is this possible to do?
Thanks...