how to gray a menuitem

[THEARTOFWEB]

Ok, but I have some difficulties understanding how to go about using it, the function is:

BOOL EnableMenuItem(      
	HMENU hMenu,
	UINT uIDEnableItem,
	UINT uEnable
);

Now, I have the menu defined in an .rc and .h files like the following:

//resource.h
#define IDM_MENU       200
#define IDM_FILE_START 201
#define IDM_FILE_STOP  202

//resource.rc
#include "resource.h"

IDM_MENU MENU DISCARDABLE
BEGIN
	POPUP "&File"
	BEGIN
		MENUITEM "Start thread...", IDM_FILE_START
		MENUITEM "Stop thread...", IDM_FILE_STOP
	END
END

The menu is loaded into the main window thru the WNDCLASS:

.lpszMenuName = MAKEINTRESOURCE(IDM_MENU);

and I capture the system messages by using the classic window callback:

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch(message)
	{
		case WM_COMMAND:
			switch(LOWORD(wParam))
			{
				case IDM_FILE_START:
				(...)
				break;

				case IDM_FILE_STOP:
				(...)
				break;
			}
			break;

		default:
		return DefWindowProc(hwnd, Message, wParam, lParam);
	}
	return 0;
}

Now when I get the IDM_FILE_START wParam thru the WM_COMMAND message how can I disable the IDM_FILE_START menuitem by using the EnableMenuItem() function?

thanks