Thread: 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?

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