title: deselect radio button
body: <p>I am working under Windows 7, Python 2.6 , Tkinter.</p>
  
  <p>I need help to deselect the radio button in the GUI each time a user selects one. I have three radio buttons in the same group, and a reset button. When a user selects the reset button, all the radio buttons need to be deselected.</p>
  
  <p>This is the declaration of the radio button: </p>
  
  <pre><code>self.Rb1 = Radiobutton (self.parent, text = 'Is this a required pre_action to the next step?', variable = self.var, value = 1)                
  self.Rb1.place (x = 100, y= 400)   
  </code></pre>
  
  <p>and the button "Reset" that binded to the command OnReset:</p>
  
  <pre><code>def OnReset(self):
      self.v1.set("Organ")
      self.v2.set("Instrument")
      self.v3.set("Surgical Action")
      self.Rb1.deselect()
  </code></pre>
  
  <p>But the <code>.deselect()</code> method does not erase the black bullet from this widget! It selects all of the radio buttons (where I have 3 radio button in the GUI). Please help me to understand how I can fix this.</p>
  
  <p>I tried to destroy the radiobutton and declare it again with the same configuration values but is destroyed and appeared again with a black bullet (i.e. selected).</p>
  
  <p>Thanks in advance.</p>