Some years ago it seemed like a decent solution to target all platforms in a native way.
But given that wxWindows is implemented in unmanaged code, and it requires a .NET binding (wxNet), it might be a bit obscure for you to surf the code and fix a bug if you ever find one.
That's why nowadays I recommend XWT, which is fully implemented in managed code (C#) and achieves the same native-way in all platforms. (And it is heavily maintained.)