How to call a method in child dynalically loaded user control

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ASP.NET

Hi,
i am changing page behavior from two separate user control to user control withing another user control, shipping user control is inside the profileList user control, which is called dynamically inside a repeater.
when a button is pressed event is fired from the parent(profileList), i want to call a method inside the shippinguser control to run another check internally.
i need to access a specific user control in one of the repeated Shipping user Control, how to access it?
the user control display something like that:

main usercontrol
 ProfileList
  Repeat
   controls 
   Shipping
  /Repeat
 /ProfileList
/Main

help is appreciated,
Roi