[Dev-C++] DialogBox returns -1

[Vlada D. <dj...@im...>]

Hi, everybody.
Here=92s another (dum) question from me: I wrote a simple program which
should display a dialog box when I push the menu button, but when I do
that, the dialog doesn=92t display. Judging from my code, DialogBox
function returns -1. What could be the cause of this? Here=92s a piece =
of
code:
=20
case WM_COMMAND:
            switch(LOWORD(wParam))
            {
                case ID_HELP_ABOUT: //menu item
                    int
ret=3DDialogBox(GetModuleHandle(NULL),MAKEINTRESOURCE(IDD_ABOUTDLG),hwnd,=
A
boutDlgProc);
                    if(ret=3D=3DIDOK)
                        MessageBox(hwnd,"Dialog
OK","Success",MB_OK|MB_ICONINFORMATION);
                    else if(ret=3D=3DIDCANCEL)
                        MessageBox(hwnd,"Dialog
cancel","Success",MB_OK|MB_ICONINFORMATION);
                    else if(ret=3D=3D-1)
                        MessageBox(hwnd,"Dialog
Fail!","Error",MB_OK|MB_ICONSTOP);
                break;
            }
        break;