How can I define a custom format expression token?

[Mohammad Amin Solhizadeh]

According to this article, we can use different token in chartview to format our data.
I want to define a new token, for example a new token named such as #dateindays that
converts DateTime data to day number in current year. Is it possible to do so, and if yes, how?

[Petar Marchev]

Hello Mohammad,

There must have been some misunderstanding. First, the provided link directed me to a help topic of RadChart and you mentioned RadChartView. These are two different controls (RadChartView being the newer one). In RadChart it is not possible to define your own token (please let me know which part of the help topic made you think that, so we can update it not to mislead other customers). I suggest you use the dateindays property of the underlying data item, which you can access like this #DATAITEM.dateindays.

Kind regards,
Petar Marchev
the Telerik team

[Mohammad Amin Solhizadeh]

Sorry, my mistake, what I meant was RadChart.
Thanks Petar. That's the thing I was looking for.