Action Sheets

Hi I am using action sheet and it looks great on the phone devices but on the iPad, the action sheet buttons are still the same size and positioned at the same place as on the phone devices. However the behavior of an action sheet on the iPad, I have seen changed with other applications to pop up as a call out to buttons. I have tried to get a handle changing the CSS properties of the .action-sheet .button and
.action-sheet-group and set both width: 100% still no change. Does anybody know how I can get a handle on setting the buttons on an action sheet to full width?