gridview and its child control

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ASP.NET

Hello friends,
I was asked in interview
If gridview has child control say textbox, which control is loaded first and why?

I felt textbox, just because each row of gridview has textbox and they are loaded during rowdatabound operation. After each rowdatabound operation then entire grid is ready.

I don't know about the fact, I looked out for some solution but did not find appropiate solution for it so thought to ask over here.

May I know was this correct solution or there is something different logic??

Thanks