Problem with GetWindowContextHelpId

Hello, in my program, a text editor, I'm using a menu and 2 edit box (keeping it simple for now). I had the following problem: When I maximized my window, the child windows would stay the same size. I create a small size-changing algorithm (there's probably an easier way, and if there is please answe my question AND tell me what another solution would be) with the following code:

Code:

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//...
case WM_SIZE:
            if(!counter){
                counter = true;
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
            if(!GetWindowRect(hWnd, &wndRect))
            {
                MessageBox(NULL, "Error while getting window rect", "ERROR", MB_ICONERROR);
                return FALSE;
            }
            EnumChildWindows(hWnd, Gui::setChildWindows, 0);
            HWND* childWindows;
            if(!Gui::getChildWindows(childWindows)){
                MessageBox(NULL, "Error while getting child windows", "ERROR", MB_ICONERROR);
                return FALSE;
            }
            length = Gui::childWindowsLength();
            Gui::deleteChildWindows();
            if(childWindows == NULL)
            {
                MessageBox(NULL, "childWindows is NULL after call do deleteChildWindows!",
                          "ERROR", MB_ICONERROR);
                return false;
            }
            DWORD ID;
            RECT rect;
            int width;
            int height;
            for(int i = 0; i < length; i++){
                std::cout << "WM_SIZE -> line " << __LINE__ << " Inside for loop" <<'\n';
                ID = GetWindowContextHelpId(childWindows[i]);
                std::cout << "WM_SIZE -> line " << __LINE__ << " Inside for loop" <<'\n';
                if(ID == hEditId){
                GetWindowRect(childWindows[i], &rect);
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hEditId)" <<'\n';
                    width = rect.left - rect.right;
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hEditId)" <<'\n';
                    height = rect.top - rect.bottom;
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hEditId)" <<'\n';
                    SetWindowPos(childWindows[i],NULL, 0, 0,(int)(width*dHERWidth),
                                (int)(height*dHERHeight), (SWP_NOMOVE|SWP_NOZORDER|SWP_SHOWWINDOW));
                }else
                if(ID == hCommandId){
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hCommandId)" <<'\n';
                    GetWindowRect(childWindows[i], &rect);
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hCommandId)" <<'\n';
                    width = rect.left - rect.right;
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hCommandId)" <<'\n';
                    height = rect.top - rect.bottom;
                    std::cout << "WM_SIZE -> line " << __LINE__ << " Inside if(ID == hCommandId)" <<'\n';
                    SetWindowPos(childWindows[i], NULL, 0, 0,(int)(width*dHCRWidth),
                                (int)(height*dHCRHeight), (SWP_NOMOVE|SWP_NOZORDER|SWP_SHOWWINDOW));
                }
            }
            UpdateWindow(hWnd);
            std::cout << "WM_SIZE -> line " << __LINE__ << '\n';
break;
//...

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The couts are there for debugging. When trying to run my application, it would close after I try to change the size. I found out, with the couts, that the problem was coming from or, at least, seemed to come from:

Code:

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GetWindowContextHelpId(childWindows[i]);

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I set the ContextHelpIds of hEdit(0x00001) which is the main EDIT and for hCommand(0x00002) which is another EDIT, but I didn't for the menus. What's wrong my code? And would there be an easier way to do what I'm trying to do? Thank you very much.

CppMaster