Paging Controls are not showing while making SPGridView's Property AllowPaging = True in my Web Part

I have created a custom web part that reads a MOSS list of 100 rows.

I bind the list to SPDatasource and SPdatasource to SPGridView.

I put DDGrid.AllowPaging to true

The problem is rows are displayed with SPGirdView's Default Page size [10].

But paging controls are not showing in my web parts.

I have put all necessary lines of codes that affects Paging in SPGridView.

Why the paging controls are now showing inside SPGridView control within my web part.

NOTE: i have created whole web part and all the controls in .cs file by overriding CreateChildControls and Render methods.

May be i will edit this post with the actual code later