Change Legend Item From Rectangle to Line with Circle

[Angelo]

I have a stacked chart combined with 2 line series.  When i create the legend, it shows all series as rectangles.  How do I make the line series show a colored line with a circle on the legend?

[Martin Ivanov]

Hello Angelo,

There are few approaches which I can suggest you in your case.

• The first one is to define a custom ItemTemplate for RadLegend and define a Path element in it for the geometry. Then you can use an IValueConverter to determine the Geometry of the Path. For example, you can bind the Presenter property of the LegendItem and in the converter check if the property hold a reference to LineSeries, create a line geometry. Otherwise, create a rectangle geometry. Check this approach in the attached project.
  
  
• The second option is to manually populate the RadLegend control with LegendItem objects. In this case you can set the MarkerGeometry of the LegendItems to whatever geometry you like. 
  
  
• The third approach is to create a custom ItemTemplate for RadLegend and define a ContentControl in it. Then create a DataTemplateSelector and asssign it to the ContentTemplateSelector property of the ContentControl. In the selector you can use different template for the series.
  
  

I created a project for all three options. Please give it a try and let me know how it goes.

Regards,
Martin Ivanov
Progress Telerik

[Angelo]

I tried the project you created and I get errors when starting the app.

[Angelo]

Hi Martin,

Thank you for your reply.  Would it be possible for you to provide another version using purely C# code?

Angelo

[Martin Ivanov]

Hello Angelo,

I converted my code from UserControl1 to C# only, except the ItemTemplate of the legend which is stored in the Application Resources dictionary. Check the attached project. I hope this is a good starting point for implementing your requirement in code-behind.

Regards,
Martin Ivanov
Progress Telerik

[Angelo]

Thank you very much Martin.  That was very helpful.