creating formulas in silverlight3 spreadsheet

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C#

hello to all

I am making the project in c# and designing in silverlight3.
As excel is not possible in silverlight3..
after all i find the excel grid means only excel sheet in which there are onle rows and columns.
now if the user wants to add and substract something ..
so i could provide all those functions..
I only want to present Formula bar, font manager and also have to allot the rows name and rows columns like
A1,A2,B1,B2
how it will be poosible