IDCompositionShadowEffect.SetAlpha

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
  1. HRESULT SetAlpha(float amount)
  2. HRESULT SetAlpha(IDCompositionAnimation animation)
    interface IDCompositionShadowEffect
    extern (Windows)
    HRESULT
    SetAlpha
    (
    IDCompositionAnimation animation
    )

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