please Help me GWT Listbox

i want aout put like

Group1
Item1-1
Item1-2
Item1-3
Item1-4
Group2
Item2-1
Item2-2
Item2-3
Item2-4
etc

for that in HTML

there is option in "Select Tag" and Option in "Select Tag" is
"optiongroup"

i want that's output in get list box

thanks

Vijay

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