Event bubbling in GridView in ASP.Net 2.0

Question

I am developing web custom control in ASP.Net 2.0 This control has four image buttons each with a different Command Name & a Command Argument. This custom control is intended to be used in a template field in a Grid View. I want to expose the CommandName of the ImageButtons as CommandName of the Column Which inturn will be read in the RowCommand event of the gridview. How do I acheve this. Please help