Hello.
I'm building a Qt application with a QTreeWidget. I've got several TopLevelItems each with some childs. But all the Items are "hanging" on the top end of the QTreeWidget like this:
Qt Code: 
  1. |
  2. [-]TopLevelItem1
  3.  |  |
  4.  |   -Child1
  5.  |  |
  6.  |   -Child2
  7.  |
  8. [-]TopLevelItem2
  9.     |
  10.      -Child3
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I read in the documentation that there is a "invisibleRootItem", but I got no success to make it visible.
How can I display the root item?
I wanted to have a tree like this:
Qt Code: 
  1. RootItem
  2.  |
  3. [-]TopLevelItem1
  4.  |  |
  5.  |   -Child1
  6.  |  |
  7.  |   -Child2
  8.  |
  9. [-]TopLevelItem2
  10.     |
  11.      -Child3
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