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Picker and List logic

Hey guys,

two questions

1. I want to have the text of a text field change as a user scrolls through their options in the picker.

2. I have a list and a button that changes from 50% opacity to 100% opacity when an element is selected. I can't seem to figure out how to make the button go back to 50% opacity when the item is de-selected.

Thanks all

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