As a double check to help prevent unintended bids, it would be helpful if the bid about to be placed were placed either inside the "OK" button, or at least above or below it. The text could be something like the following:
Bid 4♠
or
Bid Redbl
This allows the bidder to visually confirm that the number of tricks and the right suit or action (Pass, Double, Redouble) was selected.
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Show bid being made either inside or above/below the "OK" button
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