Hello Hani,

Thank you for your post.

I have been looking into your issue and have created a small sample application for you. In the sample application I am using trend lines for the series by using the TrendLineType="WeightedAverage" property. More about the Trend Lines you can find on the following link from our documentation: http://help.infragistics.com/Help/Doc/WPF/2013.2/CLR4.0/html/xamDataChart_Trend_lines.html.

Please find the attached sample application and feel free to let me know if you have any further questios on this matter.

The other option I can suggest is to log a new Product Idea in our site(http://ideas.infragistics.com) for partial TrendLines, or vote for an existing one.

Steps to create your idea:

1. Log into the Infragistics Product Ideas site at http://ideas.infragistics.com (creating a new login if needed).
2. Navigate to the product / platform channel of your choice (e.g. WPF, Windows Forms, ASP.NET, HTML5 / Ignite UI, iOS / NucliOS, etc.)
3. Add your product idea and be sure to be specific and provide as much detail as possible. Explain the context in which a feature would be used, why it is needed, why it can’t be accomplished today, and who would benefit from it. You can even add screenshots to build a stronger case. Remember that for your suggestion to be successful, you need other members of the community to vote for it. Be convincing!

The benefits of submitting the product idea yourself include:

-          Direct communication with our product management team regarding your product idea.

-          Notifications whenever new information regarding your idea becomes available.

Additional benefits of the Product Idea system include:

-          Ability to vote on your favorite product ideas to let us know which ones are the most important to you.  You will have ten votes for this and can change which ideas you are voting for at any time.

-          Allow you to shape the future of our products by requesting new controls and products altogether.

-          You and other developers can discuss existing product ideas with members of our Product Management team.

The product ideas site allows you to track the progress of your ideas at any time, see how many votes it got, read comments from other developers in the community, and see if someone from the product team has additional questions for you.

Thank you for contacting Infragistics.