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Page Activation
A property sheet can have only one active page at a time. The page that has
the activation is at the foreground of the overlapping stack of pages. The user
activates a page by selecting its tab; an application activates a page by using
the PSM_SETCURSEL message.
The property sheet sends the PSN_KILLACTIVE notification message to the page that is about to lose the activation. In
response, the page should validate any changes that the user has made to the page.
If the page requires additional user input before losing the activation, it
should use the SetWindowLong function to set the DWL_MSGRESULT value of the page to TRUE. Also, the page
should display a message box that describes the problem and provides the
recommended action. The page should set DWL_MSGRESULT to FALSE when it is okay to lose
the activation.
Before the page that is gaining the activation is visible, the property sheet
sends the PSN_SETACTIVE notification message to the page. The page should respond by initializing its
control windows.
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