close the dialog with a web page

[win]

Macro Macro1

Code:

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str dd=
;BEGIN DIALOG
;0 "" 0x90CB0AC8 0x0 0 0 900 432 "Dialog"
;4 ActiveX 0x54030000 0x0 0 0 900 432 "SHDocVw.WebBrowser {8856F961-340A-11D0-A96B-00C04FD705A2}"
;END DIALOG
;DIALOG EDITOR: "" 0x2040700 "*" "" "" ""

str controls = "4"
str ax4SHD
if(!ShowDialog(dd &sub.DlgProc &controls)) ret


#sub DlgProc
function# hDlg message wParam lParam

sel message
,case WM_INITDIALOG
,DT_SetAccelerators hDlg "1 F1"
,DT_SetAccelerators hDlg "2 F2"
,SetTimer hDlg 1 100 0
,SHDocVw.WebBrowser we4
,we4._getcontrol(id(4 hDlg))
,we4._setevents("sub.we4")
,we4.Navigate(_s.expandpath("$desktop$\web\index.html")) 
,DT_SetAutoSizeControls(hDlg "4s")

,case WM_TIMER
,sel wParam
,,case 1
,,int wies=child("" "Internet Explorer_Server" id(4 hDlg)); if(wies=0) ret
,,SetWindowSubclass(wies &sub.WndProc_Subclass 2 0)
,,KillTimer hDlg wParam
,
,case WM_DESTROY
,case WM_COMMAND goto messages2
,case WM_CLOSE
,DT_Ok(hDlg)
ret
;messages2
sel wParam
,case 1 ;mes "F1"
,case 2 ;mes "F2"
,case IDOK
,ifk(Y)
,,key Y           ;; Enter
,,ret 0
,case IDCANCEL
,ret 0
ret 1


#sub WndProc_Subclass
function# hwnd message wParam lParam uIdSubclass dwRefData

;OutWinMsg message wParam lParam ;;uncomment to see received messages

sel message
,case WM_RBUTTONDOWN
,str s=
,;>menu
,;,1 submeu 1
,;,<
,MenuPopup x.AddItems(s)
,int i=x.Show
,ret

int R=DefSubclassProc(hwnd message wParam lParam)

sel message
,case WM_NCDESTROY
,RemoveWindowSubclass(hwnd &sub.WndProc_Subclass uIdSubclass)
,
,;case ...

ret R


#sub we4_NewWindow3
function IDispatch&ppDisp @&Cancel dwFlags BSTR'bstrUrlContext BSTR'bstrUrl SHDocVw.IWebBrowser2'we3

int hDlg2=sub.Dialog2
SHDocVw.WebBrowser d2_we3._getcontrol(id(3 hDlg2))
ppDisp=d2_we3


#sub Dialog2
function# [hwndOwner]

str dd=
;BEGIN DIALOG
;0 "" 0x90CF0AC8 0x0 0 0 900 432 "Dialog2"
;3 ActiveX 0x54030000 0x0 0 0 900 432 "SHDocVw.WebBrowser {8856F961-340A-11D0-A96B-00C04FD705A2}"
;END DIALOG
;DIALOG EDITOR: "" 0x2040700 "*" "" "" ""

str controls = "3"
str ax3SHD
ret ShowDialog(dd &sub.DlgProc2 &controls hwndOwner 1) ;;modeless dialog


#sub DlgProc2
function# hDlg message wParam lParam

sel message
,case WM_INITDIALOG
,SHDocVw.WebBrowser we3
,we3._getcontrol(id(3 hDlg))
,we3._setevents("sub.we3")
,
,DT_SetAccelerators hDlg "3 F3"
,DT_SetAccelerators hDlg "4 F4"
,DT_SetAutoSizeControls hDlg "3s"
,
,case WM_HOTKEY
,sel wParam
,,case 3 ;mes "F3"
,,case 4 ;mes "F4"

,case WM_DESTROY
,case WM_COMMAND goto messages2
,case WM_CLOSE
,DT_Ok(hDlg)
ret
;messages2
sel wParam
,case 3 ;mes "F3"
,case 4 ;mes "F4"
,case IDOK
,ifk(Y)
,,key Y           ;; Enter
,,ret 0
,case IDCANCEL
,ret 0
ret 1


#sub we3_WindowClosing
function @IsChildWindow @&Cancel ;;SHDocVw.IWebBrowser2'we3

Cancel=1
int- t_hdlg
clo t_hdlg

My file, in the attachment, please extract to the desktop, you can run the code 

After a long time of thinking, I still can't understand why the main window is closed when the child window is closed(automatically).

@kevin  Can you guide me? Thank you very much. This may be something I can't understand. This problem has also been encountered before.