When the user selects a notebook page by clicking it with the mouse, by pressing the arrow keys, or by pressing the key corresponding to its associated mnemonic letter, the member function changeSelection is called. This member function invokes IlvNotebook::pageDeselected with the previous selected page as its parameter and pageSelected with the new selected page as its parameter. pageDeselected calls deSelect and triggers the Page Deselected callback. pageSelected calls select and triggers the Page Selected callback. You can retrieve their types with PageSelectedCallbackType and PageDeselectedCallbackType. Resizing the notebook page invokes the Page Resize callback. You can retrieve its type with PageResizedCallbackType.

See Associating a Callback with a Gadget.