protected override void OnRestoreInstanceState(Android.OS.Bundle savedInstanceState)
 {
     base.OnRestoreInstanceState(savedInstanceState);
     mDataset = savedInstanceState.GetSerializable("dataset") as XYMultipleSeriesDataset;
     mRenderer = savedInstanceState.GetSerializable("renderer") as XYMultipleSeriesRenderer;
     mCurrentSeries = savedInstanceState.GetSerializable("current_series") as XYSeries;
     mCurrentRenderer = savedInstanceState.GetSerializable("current_renderer") as XYSeriesRenderer;
 }
 protected override void OnRestoreInstanceState(Android.OS.Bundle savedInstanceState)
 {
     base.OnRestoreInstanceState(savedInstanceState);
     mSeries = (CategorySeries)savedInstanceState.GetSerializable("current_series");
     mRenderer = (DefaultRenderer)savedInstanceState.GetSerializable("current_renderer");
 }