Custom Picker Help

I'm trying to create a custom picker similar to the TimePicker, but for decimal numbers. I want two wheels, one for the left side of the decimal place and one for the right. On the page I want it to display as a decimal number (i.e '6.1', if I select '6' and '1' on the picker). Can anyone point me to some sample code or an example to get me started?

Thanks,

Jeff