I'm using HwndSource to host WPF controls in a Win32 (MFC) window. The Win32 project is actually native and I use a mixed-mode MFC Extension DLL in the middle to wrap the HwndSource. One of the WPF controls is a TextBox. I can delete characters from the TextBox by using the Backspace and Delete keys, or Paste text to the TextBox via the context menu, but I can't write text to it. I've been under the impression that HwndSource wraps keyboard message dispatching between the native side and the WPF side. Do I need some additional code to be able to write to the TextBox? And if so, why do Backspace and Delete work?
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