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When one of the categories is clicked, a list of instances will cascade down and each one is also clickable. Like file manager in Windows.

CDT
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It looks like a QTreeWidget (or QTreeView) with custom QItemDelegates.

See also HowTo create delegate for QTreeWidget?.

In QT Designer, you can edit the contents of the tree widget through the "Edit Items" menu entry from the context menu which opens the "Edit Tree Widget" dialog:

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Andreas Fester
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  • How can I insert default categories, like the `TCP Server`, `TCP Client` above, to the Tree View with Qt designer ?? – CDT May 23 '13 at 07:18
  • My bad, I tried tree view instead and found it cannot add items. Tree widget can. Thanks a lot ! – CDT May 23 '13 at 07:57