The OnFlatViewChange event can be implemented by a script add-in to receive notification whenever the user changes the display mode in a tab.
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       Method Name:  | 
    
       OnFlatViewChange  | 
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       Argument Type:  | 
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       Return Type:  | 
    
       none  | 
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       Description:  | 
    
       The FlatViewChangeData.tab property identifies the tab, and the mode property identifies the new Flat View mode ("off", "grouped", "mixed", "mixednofolders").  |