TreeModel not updated when expanded

Hello,
I'm searching different forums, google etc. for some hours now but couldn't find an answer.
I want to add nodes to a JTree. I use a class that extends TreeModel (not DefaultTreeModel).
When I want to add a node I use fireTreeNodesInserted(...). All the nodes which are collapsed are updated but the expanded nodes are not updated. Even if I close them and reexpand them the nodes are not added.
Does anybody now how to solve this problem? I'd really appreciate it.

Hello,
When I want to add a node I use
fireTreeNodesInserted(...). All the nodes which are
collapsed are updated but the expanded nodes are not
updated. Even if I close them and reexpand them the
nodes are not added.Do you mean you are inserting a node on a path that is already expanded? Or do you mean you are changing a node that is expanded? If you are changing a node, then you need to send the NodesChanged event, not the inserted.

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