It seems you just want to change the font-size of the picker. If you just double click on the dropdown you can click on advance and unlock that control, then you can modify the "size" property that change the fontsize of the letters inside the dropdown control.
Thanks for the suggestions. It did not work though.
Our problem is this. we are attempting to increase the "size" of the dropdown from "13" to "20". This shows up properly in the UI. However when we choose the dropdown - to pick another item, then the font and display format of that expanded drop down is where it seems to be very tiny. This same settigns works fine, when the screen orientation of the app is in landscape mode, as opposed to portrait mode.
So we were wondering if there was a way to change the CSS itself