Can't disable window (radio buttons) in my tab WIN32 API - c++

Question

I want to disable the radio buttons when I select the checkbox. It works when I pass hwnd in addFunc2(), however, I need it to be in the second tab but somehow I can't find any way to make it work.
I apologize if its confusing, I'm very new at this, and my first time posting here. Please let me know if I need to clarify it more. Please refer to the images and some of my code below:
Result of code:
What I need:
HWND hRadio1, hRadio2, hTab, g_tabPanes[2];
HWND CreateTabPane(HWND tabctrl, int id, HINSTANCE instance)
{
RECT rcTab;
GetClientRect(tabctrl, &rcTab);
TabCtrl_AdjustRect(tabctrl, FALSE, &rcTab);
int wd = rcTab.right - rcTab.left;
int hgt = rcTab.bottom - rcTab.top;
return CreateWindow(
L"static", L"",
WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS,
rcTab.left, rcTab.top, wd, hgt,
tabctrl,
(HMENU)id,
instance,
NULL
);
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_CREATE:
{
addControl(hwnd);
HINSTANCE hInst = GetModuleHandle(NULL);
RECT rc; int dx, dy;
GetClientRect(hwnd, &rc);
dx = rc.right - rc.left;
dy = rc.bottom - rc.top;
TCITEM tie = {
TCIF_TEXT | TCIF_IMAGE,
0, 0,
NULL,
0, -1, 0
};
hTab = CreateWindowEx(NULL, WC_TABCONTROL, _T(""),
WS_VISIBLE | WS_CHILD | WS_CLIPSIBLINGS,
0, 0, dx, dy, hwnd,
(HMENU)1001, hInst, NULL
);
tie.pszText = (LPWSTR)_T("Tab 1");
TabCtrl_InsertItem(hTab, 0, &tie);
tie.pszText = (LPWSTR)_T("Tab 2");
TabCtrl_InsertItem(hTab, 1, &tie);
for (int i = 0; i < 2; i++)
g_tabPanes[i] = CreateTabPane(hTab, TAB_ID + i, hInst);
addFunc1(g_tabPanes[0]);
addFunc2(g_tabPanes[1]);
break;
}
case WM_COMMAND:
{
switch (wParam)
{
case ID_CHECKBOX:
{
switch (HIWORD(wParam))
{
case BN_CLICKED:
if (SendDlgItemMessage(hwnd, ID_CHECKBOX, BM_GETCHECK, 0, 0))
{
EnableWindow(hRadio1, true);
EnableWindow(hRadio2, true);
}
else
{
EnableWindow(hRadio1, false);
EnableWindow(hRadio2, false);
}
break;
}
}
break;
case WM_NOTIFY:
{
LPNMHDR ns = (LPNMHDR)lParam;
if ((ns->idFrom == 1001) && (ns->code == TCN_SELCHANGE))
{
int pane = TabCtrl_GetCurSel(hTab);
for (int i = 0; i < 2; i++)
if (pane == i)
ShowWindow(g_tabPanes[i], SW_SHOW);
else
ShowWindow(g_tabPanes[i], SW_HIDE);
}
}
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
return 0;
}
void addFunc2(HWND hwnd)
{
HWND hCheckbox;
CreateWindow(TEXT("static"), TEXT("Duplex: "), WS_CHILD | WS_VISIBLE,
75, 10, 90, 25, hwnd, NULL, NULL, NULL);
hCheckbox = CreateWindow(L"button", L"Print on both sides", WS_CHILD | WS_VISIBLE |
BS_AUTOCHECKBOX | WS_TABSTOP,
75, 30, 150, 30, hwnd, (HMENU)ID_CHECKBOX, g_hinst, NULL);
hRadio1 = CreateWindow(L"button", L"Flip on long edge", WS_CHILD | WS_VISIBLE |
BS_AUTORADIOBUTTON | WS_TABSTOP,
75, 55, 150, 30, hwnd, (HMENU)ID_RADIO1, g_hinst, NULL);
hRadio2 = CreateWindow(L"button", L"Flip on short edge", WS_CHILD | WS_VISIBLE |
BS_AUTORADIOBUTTON | WS_TABSTOP,
75, 80, 150, 30, hwnd, (HMENU)ID_RADIO2, g_hinst, NULL);
SendMessage(hCheckbox, BM_SETCHECK, BST_CHECKED, 0);
SendMessage(hRadio1, BM_SETCHECK, BST_CHECKED, 0);