usnotifycode (USHORT)

      Notification code.

      The notification codes that indicate what action has occurred.

      CSN_SETFOCUS

        This code returns a Boolean indicating whether the circular slider control sending the notification message is gaining or losing the focus.

        param2 contains TRUE if the control is gaining the focus.

      CSN_CHANGED
        This code is sent to notify the application that the circular slider value has been changed.

        param2 contains the new value of the circular slider.

      CSN_TRACKING
        This code is sent to notify the application that the circular slider is being tracked by the mouse.

        param2 contain the inter-media value of the circular slider.

        Inter-media values are not necessarily contiguous.

      CSN_QUERYBACKGROUNDCOLOR
        This code gives the application the opportunity to set the background color of the circular slider. CLR_* or SYSCLR_* values can be returned for the background color.

        param2 is NULL.

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