Elements in tabs WinAPI

How can I add some elements(window) in my tab?

Use these:

INITCOMMONCONTROLSEX icex;
TCITEMW tie;

WM_CREATE:

icex.dwSize = sizeof(INITCOMMONCONTROLSEX);
icex.dwICC = ICC_TAB_CLASSES;

InitCommonControlsEx(&icex);

Tab = CreateWindowW(WC_TABCONTROLW, NULL, WS_CHILD | WS_VISIBLE, 
            0, 0, 200, 150, hwnd, (HMENU)ID_TABCTRL, NULL, NULL);

CreateWindowW(WC_BUTTONW, L"Add", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            250, 50, 100, 25, hwnd, (HMENU)BTN_ADD, NULL, NULL);

In BTN_ADD I make two tabs.

case BTN_ADD: {
    tie.mask = TCIF_TEXT;
    tie.pszText = (LPWSTR)L"TAB1";
    SendMessageW(Tab, TCM_GETITEMCOUNT, 0, 0);
    SendMessageW(Tab, TCM_INSERTITEMW, 1, (LPARAM)(LPTCITEM)&tie);

    tie.mask = TCIF_TEXT;
    tie.pszText = (LPWSTR)L"TAB2";
    SendMessageW(Tab, TCM_GETITEMCOUNT, 0, 0);
    SendMessageW(Tab, TCM_INSERTITEMW, 2, (LPARAM)(LPTCITEM)&tie);

    SendMessageW(Tab, TCM_GETITEMCOUNT, 0, 0);
    //Add item in tab
    CreateWindowW(WC_BUTTONW, L"BTN", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
    50, 50, 30, 30, Tab, NULL, NULL, NULL);

    break;
}

But this button added in hwnd (main), and when I open other tab, I continue to see this button. I need add content in a certain tab.

First tab

Second tab

I solved a problem. Understand, that need use a MoveWindow function. These tabs isn't content, but content attachment to window (Tab). I just created Tab via:

        Tab = CreateWindowW(WC_TABCONTROLW, NULL, WS_CHILD | WS_VISIBLE,
            0, 0, TAB_WEIGHT, TAB_HEIGHT, 
            hwnd, (HMENU)ID_TABCTRL, NULL, NULL);

Then I put down a few window (ListBox) on the Tab (which window).

        ListBoxProcesses = CreateWindowEx(WS_EX_CLIENTEDGE, L"ListBox", NULL,
            WS_CHILD | WS_VISIBLE | LBS_STANDARD | LBS_WANTKEYBOARDINPUT,
            0, 50, TAB_WEIGHT - 20, TAB_HEIGHT - 100,
            Tab, (HMENU)ID_LIST, NULL, NULL);

        ListBoxModules = CreateWindowEx(WS_EX_CLIENTEDGE, L"ListBox", NULL,
            WS_CHILD | WS_VISIBLE | LBS_STANDARD | LBS_WANTKEYBOARDINPUT,
            TAB_WEIGHT, 50, TAB_WEIGHT - 20, TAB_HEIGHT - 100,
            Tab, (HMENU)ID_LIST, NULL, NULL);

But there is one feature. First window (ListBoxProcesses) has a horizontal position 0. But second window (ListBoxModules) has TAB_WEIGHT. After I choose other tab, I call a MoveWindow function and its shifts my content.

Btw, yes, I understand that need use WM_NOTIFY message which contains this:

switch (wParam)
        {
        case ID_TABCTRL: {
            switch (SendMessageW(Tab, TCM_GETCURFOCUS, 0, 0))
            {
                case FIRST_PAGE: {

                    MoveWindow(ListBoxProcesses, 0, 50, TAB_WEIGHT - 20, TAB_HEIGHT - 100, TRUE);
                    MoveWindow(ListBoxModules, TAB_WEIGHT, 50, TAB_WEIGHT - 20, TAB_HEIGHT - 100, TRUE);

                    break;
                }
                case SECOND_PAGE: {

                    MoveWindow(ListBoxProcesses, -TAB_WEIGHT, 50, TAB_WEIGHT - 20, TAB_HEIGHT - 100, TRUE);
                    MoveWindow(ListBoxModules, 0, 50, TAB_WEIGHT - 20, TAB_HEIGHT - 100, TRUE);

                    break;
                }
                default:
                    break;
            }
            break;
        }
        default:
            break;
        }

First tab Second tab