Hello rahul,
You can take a look at the project attached that demonstrates how to add the Custom GridLines in the Legend using the Manual Items Generation approach as shown in our
help topic.
The customizations of the GridLines are done via the
ElementStyle property. It gets applied to the
Line element that visually represents the
CustomGridLine. This is shown in our
help topic.
Regards,
Evgenia
the Telerik team