title: How add button in treeview?
body: <p>I wrote a program in python 3.6.4 using tkinter library</p>
  
  <pre><code>from tkinter import ttk
  import tkinter
  
  root = tkinter.Tk()
  
  tree = ttk.Treeview(root)
  
  tree["columns"]=("one","two")
  tree.column("one", width=100 )
  tree.column("two", width=100)
  tree.heading("one", text="coulmn A")
  tree.heading("two", text="column B")
  
  tree.insert("" , 0,    text="Line 1", values=("1A","1b"))
  
  id2 = tree.insert("", 1, "dir2", text="Dir 2")
  tree.insert(id2, "end", "dir 2", text="sub dir 2", values=("2A","2B"))
  
  ##alternatively:
  tree.insert("", 3, "dir3", text="Dir 3")
  tree.insert("dir3", 3, text=" sub dir 3",values=("3A"," 3B"))
  
  tree.pack()
  root.mainloop()
  </code></pre>
  
  <p>I want add button on treeview, and I do not how.</p>