title: Getting the value of the Id Column in Tkinter Treeview
body: <p>I would like to get the text of the Id column from a <code>Tkinter</code> treeview when I double click on a child node. Using <code>tree.identify_row(event.y)</code> I get the values of the other columns returned as a dictionary. I assume the Id is the key of that dictionary, but I can't figure out how to get it.</p>
  
  <p>When I double click on subdir3, I would like to print <code>subdir3</code>, however, I only get <code>{'two': ' 3B', 'one': '3A'}</code></p>
  
  <pre><code>from Tkinter import *
  import ttk
  
  root = Tk()
  
  def OnDoubleClick(event):
      print tree.set(tree.identify_row(event.y))
  
  tree = ttk.Treeview(root)
  
  tree["columns"]=("one","two")
  tree.heading("one", text="coulmn A")
  tree.heading("two", text="column B")
  
  tree.insert("", 3, "dir3", text="Dir 3",values=("3A"," 3B"))
  tree.insert("dir3", 3, 'subdir3', text="sub dir 3",values=("3A"," 3B"))
  
  tree.bind("&lt;Double-1&gt;", OnDoubleClick)
  
  
  tree.pack()
  root.mainloop()
  </code></pre>