/// <summary>
        /// Loads the XML sample data and populates the TreeMap.
        /// </summary>
        /// <param name="sender">The object where the event handler is attached.</param>
        /// <param name="e">The event data.</param>
        private void InterpolatorsSample_Loaded(object sender, RoutedEventArgs e)
        {
            // Sample browser-specific layout change
            SampleHelpers.ChangeSampleAlignmentToStretch(this);

            treeMapControl.ItemsSource = NhlDataHelper.LoadDefaultFile();
        }
        /// <summary>
        /// Loads the XML sample data and populates the TreeMap.
        /// </summary>
        /// <param name="sender">The object where the event handler is attached.</param>
        /// <param name="e">The event data.</param>
        private void RichSample_Loaded(object sender, RoutedEventArgs e)
        {
            // Sample browser-specific layout change
            SampleHelpers.ChangeSampleAlignmentToStretch(this);

            sizeMetric.SelectedIndex  = 1;
            colorMetric.SelectedIndex = 0;

            _dataSource = NhlDataHelper.LoadDefaultFile();

            RefreshDataSource();
        }