Hi Dani, try adding the event to your Style?          <Style TargetType=''{x:Type xceed:InsertionRow}'' x:Key=''insertionrow_style''>            <EventSetter Event=''Loaded'' Handler=''InsertionRowLoaded'' />       ...

The FixedHeader and FixedFooters regions are effectively cleared when changing the Visible columns.What I suggest to workaround this issue is register a handler on the ''Loaded'' event of the MyControl placed in the FixedHeaders and to perform your registration in this handler:<xcdg:TableView.FixedHeaders>    ...