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I have a gridview control where I'm using the CellValidating event to check the data. I am setting e.IsValid = false and e.ErrorMessage = "My error message." The error message doesn't get displayed when the cell has focus. I have to make the mouse hover over the top-right corner of the cell to make it popup. Is this the intended behavior? It is usually shown when the control has focus with other controls. Is there a way to force it to display on focus?