PSN_KILLACTIVE


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PSN_KILLACTIVE
PSN_KILLACTIVE 
    lppsn = (LPPSHNOTIFY) lParam; 
Notifies a page that it is about to lose activation either because another page is being activated or the user has clicked the OK button. This notification message is sent in the form of a WM_NOTIFY message.
Returns TRUE to prevent the page from losing the activation, or FALSE to allow it.

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.

An application should validate the information the user has typed.
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.
If the dialog box procedure sets DWL_MSGRESULT to TRUE, it should display a message box to explain the problem to the user.

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