readonly checkbox in common dialog

In the common dialog, how do you retrieve the value of the checkbox for readonly? Also, where would I find information about what flags are available? Thanks.

commondialog1.flags = cdlOFNReadOnly

to get information if you are using VB6 you put the control on the form, select it and hit F1

If _______=unchecked then
msgbox "Not in readonly mode"
elseif ______=checked then
msgbox "Readonly mode"
end if

What would I put in ________, which is the name for the readonly checkbox in the common dialog for open. Thanks.

Code:

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If CommonDialog1.Flags <> cdlOFNReadOnly Then
  MsgBox "Not in readonly mode"
ElseIf CommonDialog1.Flags = cdlOFNReadOnly Then
    MsgBox "Readonly mode"
End If

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The code from above doesn't work right. If the flag was set and the checkbox was changed during the open, it doesn't reflect the change. Need more help. Thanks.