SendMessage(target, 0x0015, 0, IntPtr.Zero) //WM_SYSCOLORCHANGE SendMessage(target, 0x0031, 0, IntPtr.Zero) //WM_DWMCOMPOSITIONCHANGED Public static void SendThemeMessages(IntPtr target) Public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, IntPtr lParam)

Public static extern int SetWindowTheme(IntPtr hWnd, string pszSubAppName, string pszSubIdList) While I don't think I'll be able to perfect this approach, I will provide what I have so far, in case you or anyone else are interested in pursuing this further: Thus far, I've not gotten this approach to work 100% correctly in both directions for even a single program, but I have managed to get an existing instance of Windows 7's Task Manager to almost fully switch from Visual Styles to the Classic Theme (but not go back), send File Explorer into an identity crisis, cause Pale Moon to insist on making its titlebars largely invisible, and do some very.strange things to Notepad++, which I can't even begin to understand. I was unsuccessful, but I did find something potentially interesting: I've had partial success getting existing Windows to notice the theme change by trying to send the messages an app would normally receive when the Classic Theme is enabled.

So, I decided to see if I could do anything useful with your program.

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