I've created a new template based on OneVariant.ascx, called Card.ascx. I've created a CardAttributes.ascx control, hosted on Card.ascx where the user fills out a GridView. As the user adds and deletes rows from the grid, I need to update the ctrlProductPrice control hosted on Card.ascx with a new product price based on the number of rows in the grid. The user can still select a qty of the Card, and all will have the same grid info as attributes.

I cannot find a way to access the Card.ascx.ctrlProductPrice from CardAttributes.ascx.