How do i implement in a ListBox a select options trick I do in HTML

I'm rewriting some existing apps using GWT and I've come across a GUI
issue. In many cases where I have used a select element as a pull
down menu (only 1 item visible at a time), I leave the first item
empty and disabled. The user has to choose a different option and he/
she cannot go back to the empty element. Using a ListBox, it's easy
enough to leave the first element (index 0) empty. But how do I
disable that first element so that it can't be selected?

Thanks,
Rob

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