Use checkboxes besides the dynamically created items in the legend of the chart without defining a custom legend. Please see the attached image here : http://www.telerik.com/forums/can-i-use-checkbox-on-dashboard-tip
A solution that customizes the layout of legend items with checkboxes is documented here: http://docs.telerik.com/kendo-ui/dataviz/chart/how-to/legend-with-checkboxes