Has a form in a grid and other components, it turns out that even if the focus is on another component (textbox combobox) always has one row of the grid that is selected.There is how to change it when the focus is not on the grid not having any selected row?
This row is activated, not selected. To remove the activation set grid.SyncWithCurrencyManager = false.
FAQ:How do I turn off the ActiveRowAppearance so that the active row in the grid does not appear selected.