I want to create MDI Child window without MAXIMIZEBOX and MINIMIZEBOX and un-sizable.

Following is the code I used, It always give me the maximizeBox and MinimizeBox at title box right corner. but I don't want them. Anyone can give me a help.

//
clientcreate.hWindowMenu = hMenuStandardWindow ;
clientcreate.idFirstChild = IDM_FIRSTCHILD ;

hwndClient = CreateWindowEx (0,TEXT ("MDICLIENT"), NULL,
WS_CHILD | WS_CLIPCHILDREN | WS_VISIBLE,
0, 0, 0, 0, hwnd, (HMENU) 1, hInst,
(PSTR) &clientcreate) ;

mdicreate.szClass = szWelcomeClass ;
mdicreate.szTitle = TEXT ("Welcome") ;
mdicreate.hOwner = hInst ;
mdicreate.x = CW_USEDEFAULT ;
mdicreate.y = CW_USEDEFAULT ;
mdicreate.cx = 598;//CW_USEDEFAULT ;
mdicreate.cy = 474;//CW_USEDEFAULT ;
mdicreate.style = 0 ;
mdicreate.lParam = 0 ;

//hwndChild
hwndWelcome= (HWND) SendMessage (hwndClient,
WM_MDICREATE, 0,
(LPARAM) (LPMDICREATESTRUCT) &mdicreate) ;


Thanks!