Down Base. Down Button Method
When overridden in a derived class, handles the clicking of the down button on the spin box (also known as an up-down control).
public: abstract void DownButton();
public abstract void DownButton ();
abstract member DownButton : unit -> unit
Public MustOverride Sub DownButton ()
Notes to Implementers
When overriding this method in a derived class, be sure to call the UpdateEditText() method.