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Taskbar icon disappear on mouse

PurpleKush (11)
Hello,

I am trying to add icon task bar to my program.

When i put my mouse on the icon created on the task bar , it disappear.
The program is still running.

Any idea how to keep the icon on the task?

I think the problem is there:

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HWND hWnd;
nid.hWnd = hWnd;


Code:

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int main(array<System::String ^> ^args)
{

	// Enabling Windows XP visual effects before any controls are created
	Application::EnableVisualStyles();
	Application::SetCompatibleTextRenderingDefault(false); 

	// Create the main window and run it

	HWND hWnd;

NOTIFYICONDATA nid = {};

nid.cbSize = NOTIFYICONDATA_V2_SIZE;

nid.hWnd = hWnd;

nid.uFlags = NIF_ICON | NIF_INFO |NIF_TIP |NIF_SHOWTIP ;

nid.dwInfoFlags =NIIF_ERROR;

nid.uVersion = NOTIFYICON_VERSION_4;

static const GUID myGUID =
{0x23977b55, 0x10e0, 0x4041, {0xb8, 0x62, 0xb1, 0x95, 0x41, 0x96, 0x36, 0x69}};

nid.guidItem = myGUID;

strcpy(nid.szTip, "My application");

strcpy(nid.szInfoTitle, "Test application ");

strcpy(nid.szInfo, "Test application\n Hello World !!");

nid.hIcon = (HICON)LoadImage(NULL,"C:/TaskbarDemo.ico",IMAGE_ICON,0,0,LR_LOADFROMFILE);

Shell_NotifyIcon(NIM_ADD, &nid) ;

Shell_NotifyIcon(NIM_SETVERSION, &nid);

Sleep(5000);
Shell_NotifyIcon(NIM_DELETE, &nid) ;

I am on vc++ 2008 express winform.
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