@iLobanov I'm not sure that DataGrid is meant to be used that way. Maybe when @edvin gets online, he can look at adding custom UI controls to it. I believe that the selection behavior is interfering with the Buttons you added. A DataGrid renders items for selection as in the ImageView example. To do this, it grabs the focus and a mouse pressed event. That's why the update Button responds to a hover but not to a click. I'm not sure why the second Button, the "B" Button in my code, does work. I did notice different behavior with later items in the grid and the update did work for me if I made the overall window larger.