Method XbpSpinButton():spinDown() Foundation
Decrements the numeric value by a specific amount.
:spinDown( <nDecrement> ) --> lSuccess
This method returns the value .T. (true) when the value in the entry field could be decremented, otherwise .F. (false) is returned.
The :spinDown() method allows the value in the entry field of the spinbutton to be decremented by a specific amount without the user clicking the arrows.
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