internal void EnableBlur(IntPtr handle)
{
var accent = new AccentPolicy();
var accentStructSize = Marshal.SizeOf(accent);
accent.AccentState = AccentState.ACCENT_ENABLE_BLURBEHIND;
accent.AccentFlags = 2;
var opacity = (byte)(this.sldOpacity.Value * 255);
var col = HSVColor.FromHSV((float)this.hsvSelector.Hue, 1, 1).ToRGB();
var color = (opacity << 24) + (col.B << 16) + (col.G << 8) + col.R;
accent.GradientColor = (uint)color;
var accentPtr = Marshal.AllocHGlobal(accentStructSize);
Marshal.StructureToPtr(accent, accentPtr, false);
var data = new WindowCompositionAttributeData();
data.Attribute = WindowCompositionAttribute.WCA_ACCENT_POLICY;
data.SizeOfData = accentStructSize;
data.Data = accentPtr;
SetWindowCompositionAttribute(handle, ref data);
Marshal.FreeHGlobal(accentPtr);
}