Problems with modal dialog and PreTranslateMessage

[aragornx]

I've got a problem with displaying modal dialog after key pressing. I'm doing it in thath way: first any key pressing is receiving in PreTranslateMessage function. Then i'm sending new user message which i'm handling in function "OnFunctionKeyPressed" that recognizing specific key. And in the end - after pressing i.e. F7 key - i want to display modal dialog. After DoModal - i'm receiving following error stack:

>	SPR System.exe!CWnd::AssertValid()  Line 896 + 0x24 bytes	C++
 	SPR System.exe!AfxAssertValidObject(const CObject * pOb=0x025d48a8, const char * lpszFileName=0x0080c570, int nLine=2433)  Line 107	C++
 	SPR System.exe!CWnd::GetTopLevelParent()  Line 2435	C++
 	SPR System.exe!AfxInternalPreTranslateMessage(tagMSG * pMsg=0x002fe7f0)  Line 241 + 0x8 bytes	C++
 	SPR System.exe!CWinThread::PreTranslateMessage(tagMSG * pMsg=0x002fe7f0)  Line 777 + 0x9 bytes	C++
 	SPR System.exe!CSystemRTApp::PreTranslateMessage(tagMSG * pMsg=0x002fe7f0)  Line 1132	C++
 	SPR System.exe!AfxPreTranslateMessage(tagMSG * pMsg=0x002fe7f0)  Line 252 + 0x11 bytes	C++
 	SPR System.exe!AfxInternalPumpMessage()  Line 178 + 0x18 bytes	C++
 	SPR System.exe!CWinThread::PumpMessage()  Line 900	C++
 	SPR System.exe!AfxPumpMessage()  Line 190 + 0xd bytes	C++
 	SPR System.exe!CWnd::RunModalLoop(unsigned long dwFlags=4)  Line 4386 + 0x5 bytes	C++
 	SPR System.exe!CDialog::DoModal()  Line 584 + 0xc bytes	C++

Error in assertion

ASSERT(::IsWindow(m_hWnd));

function with key handling:

BOOL CDialogDMMenu::PreTranslateMessage(MSG* pMsg) {
	if ( pMsg->message == WM_KEYDOWN ) {
		::SendMessage( GetSafeHwnd(), WM_DMMENUKEYPRESSED, pMsg->wParam, 0 );
	} 
	return CDialog::PreTranslateMessage(pMsg);
}

next function:

afx_msg LRESULT CDialogDMMenu::OnFunctionKeyPressed(WPARAM wParam, LPARAM lParam ) {
	BYTE key = 0x00;
	switch ( wParam ) {
			case VK_F1  : key=0x01; break;
			case VK_F2  : key=0x02; break;
			case VK_F3  : key=0x03; break;
			case VK_F4  : key=0x04; break;
			case VK_F5  : key=0x05; break;
			case VK_F6  : key=0x06; break;
			case VK_F7  : key=0x07; break;
			case VK_F8  : key=0x08; break;
			case VK_F9  : key=0x09; break;
			case VK_F10 : key=0x10; break;
			case VK_F11 : key=0x11; break;
			case VK_F12 : key=0x12; break;
			case VK_ESCAPE : OnCancel(); break;
			default : break;
	}
	functionKeyPressed(key);
	return 0;
}

and ...

void CDialogDMMenu::functionKeyPressed(BYTE key) {
		CDialogNewValue newValDialog(key);
		if ( newValDialog.DoModal() == IDOK ) {
			val = newValDialog.m_fValue;
			CRealtime::getInstance()->getReader()->setCommand( command, val );
		}
}

Where is error? Is there any other way to handle key pressing in application... Thank you. Regards...