tree.setItemIcon("Root", icon);
tree.addItem("Leaf");
tree.setItemIcon("Leaf", icon);
tree.setParent("Leaf", "Root");
tree.expandItemsRecursively("Root");
tree.addActionHandler(actionHandler);
gl.addComponent(tree);
// All of FontAwesome
String allIcons = "";
for (FontIcon ic : FontAwesome.values()) {