GridViewDataColumn is not working properly

[Praveen]

So I have main grid and when I select any row from the grid, it shows me details in the form of InnerGrid. I am setting the property [GridViewDataColumn Width="*"] for last column on main grid so that it aquire rest of the space on the row. And it's working fine, but same is not working while setting this property on inner grid. How to achive this for last column on inner grid so that it aquire the pending space in the row.

Thanks.