Windows Programlama - TabControl sorunu - C ve C++

#include windows.h
#include commctrl.h

char className[]="TabControl";

LRESULT CALLBACK WindowProcedure(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpszArgument,int nFunsterStil){
MSG messages;
WNDCLASSEX wincl;

wincl.hInstance=hInstance;
wincl.lpszClassName=className;
wincl.lpfnWndProc=WindowProcedure;
wincl.style=0;
wincl.cbSize=sizeof(WNDCLASSEX);
wincl.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wincl.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
wincl.hCursor=LoadCursor(NULL,IDC_ARROW);
wincl.lpszMenuName=NULL;
wincl.cbClsExtra=0;
wincl.cbWndExtra=0;
wincl.hbrBackground=HBRUSH(COLOR_3DFACE+1);

if(!RegisterClassEx(&wincl))return 0;

HWND windowHandle=CreateWindow(className,"TabControl",WS_OVERLAPPEDWINDOW,200,325,480,320,NULL,NULL,hInstance,NULL);
ShowWindow(windowHandle,SW_SHOW);

HWND tabHandle=CreateWindow(WC_TABCONTROL,"",WS_CHILD | WS_VISIBLE,6,0,474,320,windowHandle,NULL,hInstance,NULL);

TCITEM tab1Data;
tab1Data.mask=TCIF_TEXT;
tab1Data.pszText="Tab1";
TabCtrl_InsertItem(tabHandle,0,&tab1Data);
TCITEM tab2Data;
tab2Data.mask=TCIF_TEXT;
tab2Data.pszText="Tab2";
TabCtrl_InsertItem(tabHandle,0,&tab2Data);

ShowWindow(tabHandle,SW_SHOW);

while(GetMessage(&messages,NULL,0,0)){
TranslateMessage(&messages);
DispatchMessage(&messages);
};
return messages.wParam;
}

LRESULT CALLBACK WindowProcedure (HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam){
switch(message){
      case WM_DESTROY:
         PostQuitMessage(0);
         break;
      default:
         return DefWindowProc(hwnd,message,wParam,lParam);
};
return 0;
}