title: How to change backgrond of single item in GridView
body: <p>I have a GridView with multiple items (10 items bind from List). And (for simple example) lets I have a text field and button. In text field I'll type number from 0 to 9. When I click on a button I want to change background of item with index typed in text field. So when I type 0 i want first item to change background etc etc. I have a global list and I can get object from that list but I don't know how to change background of this item on gridview</p>