Item 1
Folder 0
Sub Item 1.1
Sub Item 1.2
Sub Item 1.3
Sub Item 1.4
Sub Item 1.2
Sub Item 1.3
Sub Item 1.4
Folder 1
Sub Item 1.1
Sub Item 1.2
Sub Item 1.3
Sub Item 1.4
Sub Item 1.2
Sub Item 1.3
Sub Item 1.4
Item 3
Folder 2
Sub Item 2.1
Folder 2.1
Sub Item 2.1.1
Sub Item 2.1.2
Folder 2.1.1
Sub Item 2.1.1.1
Sub Item 2.1.1.2
Sub Item 2.1.1.3
Sub Item 2.1.1.4
Sub Item 2.1.1.5
Sub Item 2.1.4
Sub Item 2.2
Sub Item 2.3
Folder 2.2
Sub Item 2.2.1
Sub Item 2.2.2
Sub Item 2.2.3
Folder 2.3
Sub Item 2.3.1
Sub Item 2.3.2
Sub Item 2.3.3
Sub Item 2.4
Sub Item 2.5
Sub Item 2.6
Sub Item 2.7
Sub Item 2.8
Item 4
Move the mouse over Folder2, then over Folder 2.1, then over Folder 2.1.1. As you can see, Folders 2.2 and 2.3 hide Sub Items 2.1.1.2 and 2.1.1.3, respectively.