Unable to get hwnd of button inside a tab dialog - MFC C++

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MFC

TabControl

cursor

C++11

WinAPI

I am working on getting hwnd by using the mouse cursor pointing on button. The problem is I cannot reach the button which is inside a tab dialog.

I used Spy++ to get the hierarchy, there are 3 layers to reach the desired button. MainWindow (#32770) - Tab1 (#32770) - Btn1 (Button). It shows that Tab1 is not parented to SysTabControl32 and have the same parent window with SysTabControl32.

Instead of getting the Btn1, I always get SysTabControl32, which has the same hierarchy level with Tab1, means that I only can reach the SysTabControl32 but not the Tab1.

If I used WindowFromPoint and point my mouse on Btn1, I will get SysTabControl32; using ChildWindowFromPoint, I will get 0 as return value; using RealChildWindowFromPoint, I will get SysTabControl32.

Spy++ only can detect MainWindow, SysTabControl32 and Tab1 but it cannot detect Btn1. I can get all the child windows by using EnumChildWindow but the ...WindowFromPoint function still cannot find Tab1 and those child windows. Also, Spy++ is able to highlight Btn1 after I "Highlight" it but if I use 'Find Window' function in Spy++, Btn1 cannot be detected.

Is it the reason is the overlapping of sibling windows? It seems like SysTabControl32 is keep blocking the ...WindowFromPoint function to get the child windows. Does anyone know what is the cause of this situation and how to solve it? Please help..Thanks

What I have tried:

#include<windows.h>
#include<iostream>
using namespace std;

int main() {

		POINT pt;
		Sleep(3000);
		GetCursorPos(&pt);

		HWND hWnd = WindowFromPoint(pt);
		HWND hWndParent = GetParent(hWnd);
		MapWindowPoints(NULL, hWndParent, &pt, 1);
		HWND hWndChild = RealChildWindowFromPoint(hWndParent,pt);

		char class_name[100];
		char title[100];
		GetClassNameA(hWndChild,class_name, sizeof(class_name));
		GetWindowTextA(hWndChild,title,sizeof(title));
		cout <<"Window name : "<<title<<endl;
		cout <<"Class name  : "<<class_name<<endl;
		cout <<"hwnd        : "<<hWndChild<<endl<<endl;

		system("PAUSE");
		return 0;

}