When user double clicks on a folder, or on a 'plus' button next to a folder, it expands. If it was already expanded, it collapses. When a folder expands, two events are fired. The BeforeExpand is fired before ExFolderView changes its structure, so additional functions can be executed. The AfterExpand 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 body.

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