I set the Selection as : cell selection = Do Not Allow, Collumn Selection = Do Not Allow, Row Selection = Single.

I assume when I click a row of data the event ActiveRowChange  shoud fire. But I found after keep clicking on each row of the grid, the event ActiveRowChange didn't fire all the time. then I add a event handler Click just for testing. I found about 1/5 to 1/10 of the times, when I click each row, the event ActiveRowChange didn't fire, instead of it , the event click fired. Did anybody know why?

Thanks