How to Make Inner grid to be displayed as the row ofmaingrid

Question

Hi,
My task is when i click the Copyrow button in the main grid then the row of the main grid should be copied into the child grid as the row under the same main grid row without using the javascript.

I have attached the source code(The Requirement is in Panl.aspx page).
I have already done displaying row into child grid which is displaying as a separate column.I want it to be displayed as row under the same main grid row.