Client Calculation with Parent field

[Koren]

I am trying to do a calcuation in a child grid using javascript but can not seem to figure out how to reference either a field in the nestedviewtemplate or the parent row.

My grids are as follows:
grid1 (with TaxRate bound column)
  nestedviewtemplate
    panel
      multipage
         pageviewPayment
            hiddenfield taxrate
            gridPayment
               PaymentAmount (bound column)
               TaxAmount (bound column)

I have a load client event for TaxAmount to see if it is already populated.  I have a blur event on PaymentAmount to calculate the TaxAmount if not already there.  The TaxAmount should be the PaymentAmount * the TaxRate from the parent grid.  I also have a hidden field in the page view with the tax rate and a label so I know it is picking up the right tax rate.  I can not figure out how to get to any of the TaxRate fields from my blur event.  How do I traverse up through my PaymentAmount field to either the label, the hidden field or the TaxRate from the parent grid?

thanks!

[Koren]

Never mind on this.  It turns out I will need the tax rate down at the child level also so I can just use it there for the calculation.

thanks!