When RadChartView is bound to RadPivotGrid populating with data is performed by the PivotGridChartDataProvider. By default, the chart updates automatically once the selection is made. If you want to do the update on a button click you should implement а custom PivotGridChartDataProvider class and use it in the Click event.
I have also prepared a sample project for your reference which result is illustrated in the attached gif file. Could you please refer to it and let me know how it works for you?
I am looking forward to your reply.
Get quickly onboarded and successful
with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.