WPF: Get object visualized by (hierarchical) data template

I've got a TreeView with a couple of items in it. The items are visualized by a simple hierarchical data template, like this:

<HierarchicalDataTemplate x:Key="instanceTe开发者_C百科mplate">
  <CheckBox Checked="InstanceCheckChanged" Unchecked="InstanceCheckChanged">
    <Label>Hello World!</Label>
  </CheckBox>
</HierarchicalDataTemplate>

As you can see I've added an event handler, here's the code behind:

private void InstanceCheckChanged(object sender, RoutedEventArgs e)
{
  CheckBox checkBox = (CheckBox)sender;
}

In this event handler, the sender of the event is obviously the check box itself, however the checkbox is actually visualizing my normal object. My question is, how do I get the object that the checkbox visualized? Preferably I would like to have a method with a signature like this:

public MyObject GetMyObject(UIElement sender);

Is this possible in WPF, or is there a clean way to store some metadata so that I know which MyObject was checked?

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Your CheckBox's DataContext will be the object that it's representing:

var myObject = ((CheckBox)sender).DataContext as MyObject;