/// <summary>
/// Updates the is-checked state of the check box, and updates the source
/// of the binding so that changes are reflected in the view model.
/// </summary>
private void UpdateIsChecked(CheckBox checkBox, bool isChecked)
{
BindingExpression bindingExpression;
checkBox.IsChecked = isChecked;
bindingExpression = checkBox.GetBindingExpression(ToggleButton.IsCheckedProperty);
if ((object)bindingExpression != null)
bindingExpression.UpdateSource();
}