9 Answers, 1 is accepted
Currently this functionality is not supported, but I will add it as a feature request in our internal system. If we receive more requests for the same functionality, we will schedule it for investigation.
All the best,Hristo Germanov
the Telerik team

We have recently introduced legend click event and some legend improvements for the next official release of Kendo UI scheduled for the next week. This features are included with our internal builds.
Regards,Hristo Germanov
the Telerik team

Is it possible to:
1. Change behavior to decrease opacity instead of hiding
2. Add one click option to make all items visible
3. Change behavior to hide (or just decrease opacity) all items instead of clicked one
1) We will try to add functionality to prevent the hiding of the series.
2) If you want you can add button that will reset your series visibility.
3) If you can prevent the series visibility(after 1 is implemented) you can hook up to the legend series click and there you can do your custom logic for hiding the series or just set a different opacity of the series.
We will try to implement 1 for the SP1 of Kendo UI.
Hristo Germanov
the Telerik team

Is item 1 implemented in the current version?
If not, is it scheduled and for which version?
Many thanks in advance for your support!
Stefan
This feature is already implemented with the new version of Kendo UI. Could you download it and give it a try?
Regards,Hristo Germanov
Telerik

I used this on the function called on the legend item click event:
event.preventDefault();
first, is this possible to prevent the default behavior of legendItemClick: http://docs.kendoui.com/api/dataviz/chart#events-legendItemClick
If so, how can I do that?
BTW I'm using the latest version of kendo UI.
thanks.
I tried to reproduce the problem - to no avail. I have made a simple test project: http://jsbin.com/owezeGO/2/edit Am I missing something?
Regards,Hristo Germanov
Telerik