// Executes when the user navigates to this page.
protected override void OnNavigatedTo(NavigationEventArgs e)
{
m_deviceMeasurementDataList = new ObservableCollection <DeviceMeasurementData>();
m_activityWindow = new ActivityWindow("Loading Data... Please Wait...");
m_activityWindow.Show();
App app = (App)Application.Current;
m_client.GetDeviceMeasurementDataAsync(app.NodeValue);
}