Como elimino la opcion de Maximizar

Hola alguien me podria ayudar con este codigo... es algo sencillo lo que quiero... apenas estoy empezando a programar. Lo que quiero es evitar q al usuario le aparezca la opción de maximizar en la ventana.. osea quiero q ajuro use el tamaño de ventana q yo elija!

#include <windows.h>
#include <stdio.h>
#define ID_NOTEPAD 101
#define ID_SALIR 102
#define CM_PRUEBA 100
#define CM_SALIR 102

void InsertarMenu(HWND);

BOOL CALLBACK DlgProc(HWND, UINT, WPARAM, LPARAM);

/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/* Make the class name into a global variable */
char szClassName[ ] = "WindowsApp";

int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)

{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */

/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);

/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_WINLOGO);
wincl.hIconSm = LoadIcon (NULL, IDI_WINLOGO);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default color as the background of the window */

//wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

LOGBRUSH background;

background.lbStyle = BS_PATTERN;
background.lbHatch = (long) LoadImage(hThisInstance,"Fondo",IMAGE_BITMAP, 0, 0, LR_SHARED);
wincl.hbrBackground = CreateBrushIndirect(&background);

/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;

/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"ANDRES FUENTES PROGRAM", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
416, /* The programs width */
217, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);

/* Make the window visible on the screen */
InsertarMenu(hwnd);
//ShowWindow(hWnd, SW_SHOWDEFAULT);
ShowWindow (hwnd, nFunsterStil);

/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}

/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}

/* This function is called by the Windows function DispatchMessage() */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndButton = 0;
switch (message) /* handle the messages */
{
case WM_CREATE:
hwndButton = CreateWindow ("button","Decimal",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,35,40, 61, 20,
hwnd,(HMENU)ID_NOTEPAD,((LPCREATESTRUCT) lParam)->hInstance,NULL);

hwndButton = CreateWindow ("button","Binario",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,120,40, 61, 20,
hwnd,(HMENU)ID_NOTEPAD,((LPCREATESTRUCT) lParam)->hInstance,NULL);

hwndButton = CreateWindow ("button","Hexadecimal",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,200,40, 90, 20,
hwnd,(HMENU)ID_NOTEPAD,((LPCREATESTRUCT) lParam)->hInstance,NULL);

hwndButton = CreateWindow ("button","Salir",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,320,40, 61, 20,
hwnd,(HMENU)ID_SALIR,((LPCREATESTRUCT) lParam)->hInstance,NULL);
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case CM_PRUEBA:
MessageBox(hwnd, "Programa Realizado Por: Andres Fuentes", "Informacion", MB_ICONINFORMATION);
break;
case ID_NOTEPAD:
MessageBox(hwnd, "NO HAY NADA AQUI", "Informacion", MB_ICONINFORMATION);
break;
case ID_SALIR:
PostQuitMessage (0);
break;
}
break;

case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;
}

void InsertarMenu(HWND hWnd)
{
HMENU hMenu1, hMenu2;

hMenu1 = CreateMenu(); /* Manipulador de la barra de menú */
hMenu2 = CreateMenu(); /* Manipulador para el primer menú pop-up */
AppendMenu(hMenu2, MF_STRING, CM_PRUEBA, "&Informacion"); /* 1º ítem */
AppendMenu(hMenu2, MF_SEPARATOR, 0, NULL); /* 2º ítem (separador) */
AppendMenu(hMenu2, MF_STRING, CM_SALIR, "&Salir"); /* 3º ítem */
/* Inserción del menú pop-up */
AppendMenu(hMenu1, MF_STRING | MF_POPUP, (UINT)hMenu2, "&Ayuda");
SetMenu (hWnd, hMenu1); /* Asigna el menú a la ventana hWnd */
}