title: How to Determine Checked State of Checkbox
body: <p>I have a checkboxes in a page. I am not sure which event I should be using to examine the checked state. I need to determine if the checkbox is either checked or unchecked. What is the proper method for this? I have seen in researching that the Checkbox actually has three states; Checked, Unchecked, and Indeterminate. This is confusing me as it would seem that only two states will occur to the user. From a user's perspective, the Checkbox will either be Checked or Unchecked, but from my perspective, how do I handle this with the three states? Am I understanding this correctly? Also, what event should I use? Other considerations?</p>
  
  <p>Essentially what I am trying to do is ask the user whether they want to show landmarks on the new map control for WP8. If so, I need to save this setting and also I will limit the map's zoom (which I will do in another area). I just need to determine the user's preference from the checkbox control and save his or her settings. What I have is as follows thus far</p>
  
  <pre><code>&lt;CheckBox x:Name="LandmarksEnabledCheckBox" Checked="LandmarksEnabledCheckBox_Checked"&gt;
                          &lt;CheckBox.Content&gt;
                              &lt;TextBlock Text="{Binding Path=LocalizedResources.SettingsPage_LandmarksEnabled, Source={StaticResource LocalizedStrings}}"  TextWrapping="Wrap"/&gt;
                          &lt;/CheckBox.Content&gt;
                      &lt;/CheckBox&gt;
  
  private void LandmarksEnabledCheckBox_Checked(object sender, RoutedEventArgs e)
      {
          //If CheckBox is checked, set `Settings.LandmarksEnabled.Value = true`, otherwise false
          //??
      }
  </code></pre>