Hello D Warren,
Presently, there is no easy way to determine when the control has rendered completely. You can use the LayoutUpdated event handler, together with a timer, to ensure that the related control will be enabled accordingly. Another option is to use logic similar to this one:
In any case, the logic will need to be executed asynchronously, as there is no mechanism which keeps track of the completion of the execution of the rendering or animations in the chart.
I hope this information helps.
the Telerik team
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