Thanks for your reply.  I have temporarily moved on to a different project and have not been able to come back to this.  However, part of my post was answered in another post.  Graham Murray posted a reply on 08/06/2012 @9:30am to "Cannot add 2 lineSeries to 1 xamDataChart" which says:

"when using the CategoryDateTimeXAxis, unless each series has exactly the same number of entries with the same dates in the same order, you should use a seperate CategoryDateTimeXAxis per series."

That answers the first part of my post where the values on the second series are being ignored and are using the ones from the first data series.

I think the answer to the second part of my question as to the second data series not displaying in the chart at all is to not use the CatageoryDateTimeXAxis.  It just seems to be doing a lot of stuff on it's own that I don't want. (Like the above as well as "the CategoryDateTimeXAxis handles reordering of unordered data and auto-min/max") I wasn't aware it behaved that way.  I will most likely have to go to a basic CategoryXAxis.

Hello Michael,

It has been a while since you have made your post, in case you still need support I will be glad to assist you further. I suppose the other community members can benefit from this answer as well. I have been looking into your post, but it seems like that I am missing something in your scenario, so if this is still an issue for you, could you please send an isolated sample project, where the issue is reproduced, so I can investigate it further for you.

Feel free to write me if you have further questions.

I know this post is pretty old, but I'm hoping I can still get a little help.  I am having the exact same problem that tzieger did.  I'll see if I can explain it.

The data items I am displaying have a Price on the Y-Axis and a DateTime on the X-Axis.  When I add a single series, everything displays correctly.  However, when I add a second series, the new data points are not displayed correctly.  The DateTime values from the second series are ignored and are plotted at the same X-Axis values as the first series that was added to the collection.

For example:
    Series 1 has two items: ($2.34, 9:34:23) ($2.35, 9:37:13)
    Series 2 has two items: ($2.38, 9:35:51) ($2.36, 9:36:44)

The data points from Series 2 display at the points from Series 1.  Thus, Series 2 effectively becomes ($2.38, 9:34:23) ($2.36, 9:37:13)

I have tried your workaround by creating an axis per series, but not matter what I do, the chart comes up blank.  The Y-Axis label displays correctly, but there is nothing displayed for the X-Axis labels and no series are displayed on the chart.

I'm using XamDataChart Version 12.1.  Here is the before and after xaml.

Before:
<igXaml:XamDataChart x:Name="igdcOrderUpdates">
    <igXaml:XamDataChart.Axes>
        <igXaml:CategoryDateTimeXAxis x:Name="xAxisOrderUpdates" ItemsSource="{Binding ElementName=igdcOrderUpdates, Path=Series[(System:Int32)0].ItemsSource}" DateTimeMemberPath="OrderTimeStamp" Label="{}{OrderTimeStamp:HH:mm:ss}">
            <igXaml:CategoryDateTimeXAxis.LabelSettings>
                <igXaml:AxisLabelSettings Extent="55" VerticalAlignment="Center" Angle="45" />
            </igXaml:CategoryDateTimeXAxis.LabelSettings>
        </igXaml:CategoryDateTimeXAxis>
        <igXaml:NumericYAxis x:Name="yAxisOrderUpdates" Label="{}{0:C}" MaximumValue="{Binding Path=MaxYAxisValue, Mode=TwoWay}" MinimumValue="{Binding Path=MinYAxisValue, Mode=TwoWay}">
            <igXaml:NumericYAxis.LabelSettings>
                <igXaml:AxisLabelSettings Extent="50" HorizontalAlignment="Center" />
            </igXaml:NumericYAxis.LabelSettings>
        </igXaml:NumericYAxis>
    </igXaml:XamDataChart.Axes>
    <glpCharts:SeriesBinder.BindingInfo>
        <glpCharts:SeriesBindingInfo ItemsSource="{Binding Path=OrderSeries}">
            <glpCharts:SeriesBindingInfo.SeriesTemplate>
                <DataTemplate>
                    <igXaml:LineSeries ItemsSource="{Binding Item.Data}" ValueMemberPath="{Binding Item.ValueMemberPath}" XAxis="{Binding Path=Owner.Axes[(System:Int32)0]}" YAxis="{Binding Path=Owner.Axes[(System:Int32)1]}" />
                </DataTemplate>
            </glpCharts:SeriesBindingInfo.SeriesTemplate>
        </glpCharts:SeriesBindingInfo>
    </glpCharts:SeriesBinder.BindingInfo>
</igXaml:XamDataChart>

After:
<igXaml:XamDataChart x:Name="igdcOrderUpdates">
    <igXaml:XamDataChart.Axes>
        <igXaml:NumericYAxis x:Name="yAxisOrderUpdates" Label="{}{0:C}" MaximumValue="{Binding Path=MaxYAxisValue, Mode=TwoWay}" MinimumValue="{Binding Path=MinYAxisValue, Mode=TwoWay}">
            <igXaml:NumericYAxis.LabelSettings>
                <igXaml:AxisLabelSettings Extent="50" HorizontalAlignment="Center" />
            </igXaml:NumericYAxis.LabelSettings>
        </igXaml:NumericYAxis>
    </igXaml:XamDataChart.Axes>
    <glpCharts:SeriesBinder.BindingInfo>
        <glpCharts:SeriesBindingInfo ItemsSource="{Binding Path=OrderSeries}">
            <glpCharts:SeriesBindingInfo.SeriesTemplate>
                <DataTemplate>
                    <igXaml:LineSeries ItemsSource="{Binding Item.Data, Mode=OneWay}" ValueMemberPath="{Binding Item.ValueMemberPath}" YAxis="{Binding Path=Owner.Axes[(System:Int32)0]}">
                        <igXaml:LineSeries.XAxis>
                            <igXaml:CategoryDateTimeXAxis x:Name="xAxisOrderUpdates" DateTimeMemberPath="{Binding OrderTimeStamp}" Label="{}{OrderTimeStamp:HH:mm:ss}">
                                <igXaml:CategoryDateTimeXAxis.LabelSettings>
                                    <igXaml:AxisLabelSettings Extent="55" VerticalAlignment="Center" Angle="45" />
                                </igXaml:CategoryDateTimeXAxis.LabelSettings>
                            </igXaml:CategoryDateTimeXAxis>
                        </igXaml:LineSeries.XAxis>
                    </igXaml:LineSeries>
                </DataTemplate>
            </glpCharts:SeriesBindingInfo.SeriesTemplate>
        </glpCharts:SeriesBindingInfo>
    </glpCharts:SeriesBinder.BindingInfo>
</igXaml:XamDataChart>

Hello,

I finally figured out what's going on..... I went through your code and find out you encapsulate ItemsSource in an Item object.... I just changed my code like that and everything works fine :

ItemsSource="{Binding Item.DataSource, Mode=OneWay}"

Thanks for you support Graham.

Steph

One more thing,

if I debug, I can see in my chart the right number of series but it's like the binding doesn't work for datapoints (ItemsSource is null).......