Help with Win32: PostQuitMessage(0) doesn't post WM_QUIT apparently, because the message loop is not exited.

[Ruby The Roobster]

Here is the message loop:
```d
while(GetMessage(&msg, hwnd,0,0))   {
    if(msg.message == WM_QUIT)
       break;
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}
```
The WndProc(LRESULT CALLBACK):
```d
extern(Windows)
LRESULT WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM 
lparam) nothrow	{
	switch(msg)	{
		case WM_CREATE:
			//...
			return 0;
			break;
		case WM_DESTROY:
			try	{
				entity.terminate();
			}
			catch(Throwable e)	{
				PostQuitMessage(1);
			}
			PostQuitMessage(0);
			break;
		default:
	}
return DefWindowProc(hwnd,msg,wparam,lparam);
}
```

When I run the program and close the window, the program still 
runs in background mode.  I don't know why this happens nor how 
to fix it.  Does anybody know what's going on?