I've got a hybrid Chart where the high-level definitions are in XAML, but I build the DataSeries at run-time.  I'm getting a case where I have a Legend on the right, but there are no entries there.  Here's the XAML:

Here's the code-behind that populates the chart via a non-default constructor on a Window:

Some of the high points:

• As you see in the XAML, the ItemsMapping is pointed to the DataContext of the Window
• The DataContext is Collection<LoggedACMeterData>
• A LoggedACMeter object has, among other properties, a DateTime Timestamp, a double WattsAllPhases, and a Circuit object which has a String Name property.
• At the moment, the dateRange is ignored.
• I hand in the IEnumerable<Circuit> to the constructor with the idea of building a DataSeries for each Circuit.
• To do the above, I use the ChartFilterDescriptor on each DataSeries to only pull records from the DataContext that matches the circuit name.

So the grid is getting set up properly, with the X-Axis correct, ane the Y-Axis labelled properly, and multiple color-coded series.  But the Legend is empty.  Thoughts? 

Attached is a screen shot of what I get.

David Yon

 (on edit: I guess I really mean a SeriesMapping, not a DataSeries as described above)

  public class NumericTextBoxColumn :GridViewBoundColumnBase
    {
        public override FrameworkElement CreateCellEditElement(GridViewCell cell, object dataItem)
        {
            this.BindingTarget = NumericTextBox.TextProperty;
            NumericTextBox control = new NumericTextBox();
            control.SetBinding(this.BindingTarget, this.CreateValueBinding());
            return control;
        }

        private Binding CreateValueBinding()
        {
            Binding valueBinding = new Binding();
            valueBinding.Mode = BindingMode.TwoWay;
            valueBinding.NotifyOnValidationError = true;
            valueBinding.ValidatesOnExceptions = true;
            valueBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            valueBinding.Path = new PropertyPath(this.DataMemberBinding.Path.Path);

            return valueBinding;
        }
    }

   public class NumericTextBox: TextBox
    {
       
        protected override void OnPreviewTextInput(System.Windows.Input.TextCompositionEventArgs e)
        {
            if(string.IsNullOrEmpty(e.Text))
            {
                e.Handled = true;
                return;
            }
           
            e.Handled = !AreAllValidNumericChars(e.Text);
            base.OnPreviewTextInput(e);
        }

        private bool AreAllValidNumericChars(string str)
        {
            foreach (char c in str)
            {
                if (c == '.' && base.Text.Contains(".")) return false;
                if (!(Char.IsNumber(c) || c=='.' )) return false;
            }

            return true;
        }

    }