PSN_WIZBACK


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PSN_WIZBACK
PSN_WIZBACK 
    lppsn = (LPPSHNOTIFY) lParam; 
Notifies a page that the user has clicked the Back button in a wizard property sheet. This notification message is sent in the form of a WM_NOTIFY message.
Returns -1 to prevent the property sheet from advancing to the previous page or zero otherwise.

lppsn
Address of a PSHNOTIFY structure that contains information about the notification. The lParam member of this structure does not contain any information. The hwndFrom member of the hdr member of this structure contains the handle to the property sheet.

To set the return value, the dialog box procedure for the page must use the SetWindowLong function with the DWL_MSGRESULT value, and the dialog box procedure must return TRUE.

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