When user double clicks on a folder, or on a '+' button next to a folder, it expands. Or, if it was already expanded, it collapses. When a folder collapses, two events are fired. BeforeCollapse is fired before ExFolderView changes its structure, so additional functions can be executed. The AfterCollapse event is fired after the structure has changed. Usually, expanding and collapsing folders will result in more or fewer folders visible after this event, so if some additional code is required it should be put inside this event.

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