private void SetWindowTransparence()
{
var windowHelper = new WindowInteropHelper(AssociatedObject);
var accent = new NonClientRegionAPI.AccentPolicy();
var accentStructSize = Marshal.SizeOf(accent);
accent.AccentState = NonClientRegionAPI.AccentState.ACCENT_ENABLE_BLURBEHIND;
var accentPtr = Marshal.AllocHGlobal(accentStructSize);
Marshal.StructureToPtr(accent, accentPtr, false);
var data = new NonClientRegionAPI.WindowCompositionAttributeData();
data.Attribute = NonClientRegionAPI.WindowCompositionAttribute.WCA_ACCENT_POLICY;
data.SizeOfData = accentStructSize;
data.Data = accentPtr;
NonClientRegionAPI.SetWindowCompositionAttribute(windowHelper.Handle, ref data);
Marshal.FreeHGlobal(accentPtr);
}
