Problem in refreshing the context node

Dear Friends,

I am new to CRM,

I have problem while creating multiple Opportunity's with in the same session.

Problem: I am able to crate Opportunity successfully, but when i click on new button for creating one more opportunity, the previous opportunity data was appearing in the current Opportunity Ovwerview Screen.This is happening for only one context node which is binding from Custome Controler.

How could i clear that data..?

Please help me on this.

Thanks&Regards

Nani