Не закрывается дочернее окно

#include "windows.h"
 
 
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 
char szIconName[]="MYICON"; 
char szProgName[]="Progname"; 
char szText[]="";
char szTitle1[]="Example";
 
HINSTANCE hInst;
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
 
HWND hWnd; 
MSG lpMsg; 
WNDCLASS w; 
 
 
w.lpszClassName=szProgName; 
w.hInstance=hInstance; 
w.lpfnWndProc=WndProc; 
w.hCursor=LoadCursor(NULL, IDC_ARROW);
w.hIcon=LoadIcon(hInstance, szIconName); 
w.lpszMenuName=0; 
w.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
w.style=CS_HREDRAW|CS_VREDRAW; 
w.cbClsExtra=0;
w.cbWndExtra=0;
 
 
if(!RegisterClass(&w))
return 0;
 
 
hWnd=CreateWindow(szProgName, 
    "№4", 
WS_OVERLAPPEDWINDOW, 
100, 
100, 
500, 
400, 
(HWND)NULL, 
(HMENU)NULL, 
(HINSTANCE)hInstance, 
(HINSTANCE)NULL); 
 
 
ShowWindow(hWnd, nCmdShow);
 
UpdateWindow(hWnd);
 
while(GetMessage(&lpMsg, NULL, 0, 0)) { 
TranslateMessage(&lpMsg); 
DispatchMessage(&lpMsg); 
}
return(lpMsg.wParam);
}
 
//Функция окна
LRESULT CALLBACK WndProc(HWND hWnd, UINT messg,
WPARAM wParam, LPARAM lParam)
{
HDC hdc;
HWND hw;
HINSTANCE hInst;
PAINTSTRUCT ps; 
 
 
switch(messg)
{
 
int x,y;
 
 
 
case WM_LBUTTONDOWN:
    {
        hw = CreateWindow("STATIC",szTitle1,WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                    300,300,150,200,0,0,NULL,0);
 return 0;
    }
 
 
case WM_DESTROY:
PostQuitMessage(0); 
break;
 
default:
return(DefWindowProc(hWnd, messg, wParam, lParam)); 
}
return 0;
}

        hw = CreateWindow(NULL,szTitle1,WS_CHILD,
                    300,300,150,200,hWnd,0,NULL,0);