I posted this question in the comments on the cssgallery.info site but maybe someone else has found a solution. I've implemented the picker w/in a view technique that Dan Tamas suggested. I did so within a ScrollableView. When the picker's view slides up, it's like it's transparent as the controls from the scrollable view show through.
I've tried setting a zIndex and backgroundColor on the picker's view. But that had no effect. I tried using a ScrollView instead of a ScrollableView but then the picker itself, not the view that wraps it, shows up atop the ScrollView blocking all interaction.
It looks to me that you are doing this twice
And try to do this the last possible
Let me know
You will have to set the view that contains the picker at a higher zIndex, or try to add it the last one when you are building the things inside your code.
But as Hal said we might use a pastie to see what's there :)
Repeating my comment so that this gets bumped…
See http://pastie.org/1312147 for the relevant section of my code.