The event handler receives an argument of type FocusedColumnChangedEventArgs containing data related to this event.
The following
FocusedColumnChangedEventArgs properties provide information specific to this event.
The event is raised when end-users move focus from column to column or when changing the FocusedColumn property value via code. The following cases can take place:
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focus moves from one column to another;
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no column is focused (this can be the result of deleting the focused column);
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a column is focused after no column was focused.