Setup an example Treeview

def setup_tree(self):
        """Setup an example Treeview"""
        self.tree.insert("", tk.END, text="Example 1", iid="1")
        self.tree.insert("", tk.END, text="Example 2", iid="2")
        self.tree.insert("2", tk.END, text="Example Child")
        self.tree.heading("#0", text="Example heading")