Problem with Tax value display

I have a TaxRate table with TaxId, TaxName, TaxValue fields

TaxItemGroup table with TaxItemId, TaxItemName fields

TaxItemGroupRate table with TaxItemId, TaxId fields

I have a form with 2 tabpages, one for setting up the TaxItemGroup and one for setting many TaxRates of each TaxItemGroup. So the datasource will be 2 tables TaxItemGroup and TaxItemGroupRate.

But in the tabpage of setting the rates, I want to show the values of the rates like the String control in the Grid of that tabpage, please tell me how to do it?

Do I need to create a method? Where? and what should I write in that method?

Thanks so much!