title: set up the entry of a combobox (gtk)
body: <p>How could I set up the text of a combobox without knowing its id? I have a combobox populated with a list of name ('Jack','Emily','Paul',...). By default, the combo is set on -1 but I want it to be set on "Paul". </p>
  
  <p>Here is my code to declare and populate the combo with tuple (id,fabName) :</p>
  
  <pre><code>    self.cmbFabricant = builder.get_object("cmbFabricant")
      self.cmbFabricant.set_model(lstStore)
      self.cmbFabricant.set_entry_text_column(1)
  </code></pre>
  
  <p>Now, I'd like to set the combobox on the item called "Paul". I thought I could write :</p>
  
  <pre><code>    self.cmbFabricant.set_active_id('Paul')
  </code></pre>
  
  <p>I was wrong.</p>