The current implementation using SynchroVisible and With fails when there is more than three chart to synchronize. So I modified the code and added a central agent to keep in synch more charts. We just need to define an instance of it as a resource:

<Window.Resources>
       …

        <ddd:MultiChartSynchronizer x:Key="mainSynchro"/>
    </Window.Resources>

and then “subscribe” each chart to keep in synch with:

<ddd:ChartPlotter x:Name="price" ddd:SynchroVisible.Axis="X" 

ddd:SynchroVisible.Using="{StaticResource mainSynchro}"

LegendVisibility="Hidden" NewLegendVisible="False" Grid.Row="1">

obviously we can have multiple instance of synchronizer object to create more context in which chart align.

You can find and follow this project on Bitbucket.