GWT Combobox

I am new to GWT Please Help me on this
I have a combo box .On typing in the combo box I will get a filtered
combo list based on the letters I enter.
my requirement is " On entering the filter criteria the criteriafield
should display capital letters even if the caps lock is not on" .so
how can I format the criteria field of a combo box so that the
criteria field display only capital letters.

Please help me with a solution....

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