This question is locked. New answers and comments are not allowed.
I have this problem in my own app, but it is also most easily seen on the demo's site:
When you begin to type a value to search for in the textbox, if I have an item already selected in the grid I lose focus to it after typing the first letter.
i.e.
1. Click on an item in the grid to select that row
2. Click into the search textbox and start typing. I can only get 1 letter before the textbox loses focus back to the grid.