Bind chart control present inside a user control in web application.

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C#

ASP.NET

user-controls

I have a user control inside my .aspx page.On that user control i am opening another
user control.On the parent user control i have a chart control.
On the child user controls i have some fields which the user has to fill and submit.
Once the submit button is clicked I want the chart control which is present inside
the parent user control to get binded with the details.
This is the code that i want to execute:

CategoryScoreChart.DataSource = tempTable;
       CategoryScoreChart.DataBind();

But i get an error as the chart "CategoryScoreChart" is present inside parent control.
How can i access that chart and bind it which is present inside the parent user control?