TRACKMOUSEEVENT (error C2065)

Guy,


In a child window WndProc(), I would like to use TrackMouseEvent(), inside WM_MOUSEMOVE block so I can fired up message on WM_MOUSELEAVE.

To use TrackMouseEvent(), i need to declare TRACKMOUSEEVENT structure and fill up its data members. However, my MS Visual Studio 2005, keep telling me it I have error C2065: undeclared identifier.

I have include windows.h in the header file.

It is have been outdated?


Thanks

Code:

LRESULT CALLBACK SplitterPanel::WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	static HCURSOR		hcursor1, hcursor2;
	static bool			isHovering;
	TRACKMOUSEEVENT tm; //the error pointing to

	
	switch(iMsg){
		case WM_CREATE :	
			hcursor1 = ::LoadCursor(NULL, IDC_SIZEWE);
			hcursor2 = ::LoadCursor(NULL, IDC_ARROW);
			break;

		case WM_MOUSEMOVE:
			break;
		
		case WM_CLOSE :
			DestroyWindow(hwnd);		  
			break;

		case WM_DESTROY :
			PostQuitMessage(0);		  
			break;
	}
	
	
	
	return ::DefWindowProc(hwnd, iMsg, wParam, lParam);
}