I guess you mean the BindingNavigator? It is just bound to a BindingSource. The buttons are assigned the regular action to do, for example in MoveNextItem the default BindingNavigatorMoveNextItem button is selected. When this button is clicked the BindingSource.MoveNext method is called. If you need custom code you can doubleclick the button and write code for it's Click event, to prevent the default call to BS method you just select "(none)" for its MoveNextItem in this case.

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