That's expected. You can't get a reference to something which isn't rendered (grid1).
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Verified your advice. Thanks again.
My real problem was tab2 not refresh properly based on tab1 row selection.
It took me few hours to figure out root cause.
I was wondering why grid not rendering properly. Eventually I found out one possible situation, EF Core not reload properly.
Add AsNoTracking() , solve this problem.
Nothing related to RadzenGrid.
getPicSnosResult = await AppDb.PicSnos.Where(a => a.PIC_NO == x.PIC_NO && a.PIC_LINE == x.PIC_LINE).OrderBy(a => a.IN_SNO).AsNoTracking().ToListAsync();
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