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WSpinButton:Init() Method
Construct a spin button control object
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Syntax
WSpinButton{ <oParent>, [ <nId> ] , <aParams>, [ <lCreate> ] }
             -->   SELF

Arguments
<oParent> is the parent (owner) window object.  Just as
<oParent> is the owner of the control object, the parent's
hWnd will be the actual owner of the control's window (if it
has a window on the screen).

<nId> is an optional number.  It will (eventually) default to
self:CreateId(), but you normally specify it as the same
value as in a dialog containing the control.

<aParams> is an array  { <lHoriz> [ , <oHelp> ] }  where:

<lHoriz> is .T. to mean arrows that face left and right, or
.F. for up and down arrows.

<oHelp> can be used to specify a help object.

<lCreate> specifies whether the window object's Create()
method is to be invoked immediately.  Usually you want the
default (.F.).

Returns
SELF.

Description
This method initialises a spin button control that displays
two arrows, either pointing up and down, or left and right.
By default, this method will NOT create a window on the screen
(because controls are usually automatically created in
dialogs).

As this is implemented using an owner-drawn button, to put
this control in a dialog you should use a button with the
BS_OWNERDRAW style.

Example