title: Get label value from dynamically created menu items [tkinter]
body: <p>I have a cascade menu in a parent menu. The cascade items are created dynamically with <code>add_checkbutton</code> method.</p>
  
  <p>A user should be able to "check" menu items and select/confirm them. However, I don't know how to access text in the menu items, to decide which item is selected.</p>
  
  <p>Obvious solution is to generate <code>tk.StringVar</code> dynamically, but I would like to avoid that since it complicates the code significantly.</p>
  
  <p>How to get value of the menu label/text in tkinter?  Is there other solution to the problem?</p>