title: Appending values to TTK Combobox['values'] without reloading combobox
body: <p>I need to add values to a ttk.combobox without reloading the whole thing. The current selection on the GUI should not be reloaded when values are added to it.</p>
  
  <p>I need something like this:</p>
  
  <pre><code>for string in listofstrings:
      if string not in self.combobox1['values']:
          self.combobox1['values'].append(string)
  </code></pre>
  
  <p>When I try it like this, I get this error: </p>
  
  <blockquote>
    <p>AttributeError: 'tuple' object has no attribute 'append'</p>
  </blockquote>
  
  <p>(as expected).</p>
  
  <p>Thanks in advance for the help.</p>