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Yet another solution:
//TODO: Don't forget to include using System.Runtime.InteropServices.
internal static class NativeWinAPI
internal static readonly int GWL_EXSTYLE = -20;
internal static readonly int WS_EX_COMPOSITED = 0x02000000;
internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);
internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
And your form constructor should look as follows:
int style = NativeWinAPI.GetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE);
style |= NativeWinAPI.WS_EX_COMPOSITED;
NativeWinAPI.SetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE, style);
In the code above, you might change this.Handle to something like MyFlickeringPanel.Handle
You can read a bit more about it here: Extended Window Styles and here: CreateWindowEx.
With WS_EX_COMPOSITED set, all descendants of a window get bottom-to-top painting order using double-buffering. Bottom-to-top painting order allows a descendent window to have translucency (alpha) and transparency (color-key) effects, but only if the descendent window also has the WS_EX_TRANSPARENT bit set. Double-buffering allows the window and its descendents to be painted without flicker.
answered 23 mins ago