RegisterHotKey throwing tantrum

I'm looking for advance here with RegisterHotKey. It's a general function call that looks like this:

Code:

if (! ::RegisterHotKey(MsgDlg.m_hWnd, m_nId, sModifier, sKey) )

However, MsgDlg was created and on a different thread simply because that thread is running the message loop. RegisterHotKey won't let me register a hotkey for a dialog that was created on a different thread (which is a pretty stupid thing to restrict).
So I'm looking for advance on how to make this doable. Do I have to go around by sending an event to the dialog and calling RegisterHotKey from there?

Since the hotkey is for MsgDlg, then wouldn't it make sense for that dialog code to handle registration? And to ensure it's done on the creating/message-loop thread, you could add a public member function that simply posts a message to itself.

gg

The MsgDlg is just a window running in the background to accept events such as messages from Shell_NotifyIcon.
It's a window in a utility DLL used to build a framework around API functions, so it isn't really possible to do it that way...

Code:

void AddTrayIcon(const CString& strToolTip, const CString& strBalloonTip, const CString& strBalloonTitle, HICON hIcon, UINT nTimeOut, CTrayCallbacks Callbacks)
{
	// ...
	traydata.hWnd = MsgDlg.m_hWnd; // hOwner;
	// ...
	MsgDlg.m_TrayCallbacks = Callbacks;
	Shell_NotifyIcon(NIM_ADD, &traydata);
	Shell_NotifyIcon(NIM_SETVERSION, &traydata);
}

Code:

CHotKey::CHotKey(int nId, uint32_t sModifier, uint32_t sKey, pp<CCallback> HotkeyCallback): m_nId(nId)
{
	if (! ::RegisterHotKey(MsgDlg.m_hWnd, m_nId, sModifier, sKey) )
	{
		TRACE("WARNING! RegisterHotKey failed with:\nError: 0x%X\nDescription: %s", GetLastError(), ErrDescFromHRESULT( GetLastError() ));
		DebugBreak();
	}
	MsgDlg.m_HotkeyCallback = HotkeyCallback;
}

Code:

class AFX_EXT_CLASS CHotKey