WM_PRESPARAMCHANGED (in Circular Slider Controls) - Parameters

attrtype (ULONG)

Attribute type.

Presentation parameter attribute identity. The following presentation parameters are initialized by the slider control. The initial value of each is shown in the following list:

PP_FOREGROUNDCOLOR or PP_FOREGROUNDCOLORINDEX

Item foreground color; used when displaying text and bit maps. This color is initialized to SYSCLR_WINDOWTEXT.
PP_BACKGROUNDCOLOR or PP_BACKGROUNDCOLORINDEX
Slider background color; used for entire control as the background. This color is initialized to SYSCLR_WINDOW.

ulReserved (ULONG)

Reserved value, should be 0.

ulReserved (ULONG)

Reserved value, must be 0.

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