Can't change Tree icon in Vaadin

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I use Vaadin 7. I tried to change the component's icon with the following code :

Tree tree = new Tree("The Planets and Major Moons");
tree.setIcon(new ThemeResource("img/inode-directory.png"));
.... //here I fill the tree

When I run the application I still get the same icon (default icon) of Vaadin Tree. Is there something that I forgot to add?

asked 3 mins ago

Tantaoui El Mehdi

72