When set, the BindingNavigator.MovePreviousItem property generates the Control.Click event handler for the Move Previous button. This event handler calls the BindingSource.MovePrevious method when the Move Previous button is clicked at run time.

This property is null if it was not previously set and it is accessed before the BindingNavigator.AddStandardItems method is implicitly or explicitly called.

The System.Windows.Forms.BindingNavigator control will disable the Move Previous button under the following run-time circumstances: the BindingNavigator.BindingSource property is null or the BindingSource.Position property is less than or equal to 0.

In the default implementation, this property represents a control of type System.Windows.Forms.ToolStripButton.