Hello i use this on vadin 23 is ok <span style="background-color

Directory tree
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hello i use this on vadin 23 is ok

but how can i add or remove an item ?

2

> Vaadin 23

Use 2-series of the Tree the latest version 2.4.0.

> but how can i add or remove an item ?

This works exactly the same way as with Grid/TreeGrid, i.e. remove/add item in the data source and then call dataProvider.refreshAll();