GUI Tab Control width

[k4ghg]

Hi - I am trying to program a Tab controlled used a GUI interface in C. I am new and the code below (Which works) was found on the internet :

The master Window is:

 HWND hwnd = CreateWindowExW(0, CLASS_NAME, L"Tab Control with Listbox",
                                WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
                                550, 300,  NULL, NULL, hInstance, NULL);

and the Tab is:

hwndTab = CreateWindowEx(0,WC_TABCONTROL, "", WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN |
                                         WS_VISIBLE | WS_OVERLAPPEDWINDOW, 0, 10, 15, 100, hwnd, (HMENU)100, GetModuleHandle(NULL),
                                         NULL);

The problem is that it appear on the entire screen. Is there a way to control the width? Thank You...