Event handling in another page from the MasterPage

Hello

I have a check box in the Master Page (StatMaster.master)

and I have another Page that’s inherits the master page (Stat.aspx) conatins statistics chart.

the chart is in PageLoad

what I need to do :

If the user checked the checkBox in the master page , The chart will refresh and display different result.

I could not use the checkbox in Stat.aspx How can I do that?

P.s: Im using VB not C#

Thank you