no border in first row when making first row fix in fin grid and not able to remove index for header column

Hello Team,

I have requirement where in i need to fix the header row and do not show the index for that row. I have done that thing, but it comes with bugs. first row after the fix row comes without border and even thought i changed the index starting from 1 to 0 but i am not able to 0 or i mean to say hide zero.

Start by reproducing the fixed-header configuration described in the issue, including hiding the index and changing its starting value. Trace the first-row border rendering and index-column behavior in the relevant grid code. Done means the first row retains its border and the zero index is hidden without affecting other rows.

Written by the indexing model from the issue text.