FMXGrid and Cell Alignment & Comments

I'm having troubles (center) aligning cells in my fmxgrid.


This seems to work just fine:
  grd.RandomFill;
  grd.Columns[2].HorzAlignment := TTextAlign.Center;
  grd.Columns[3].HorzAlignment := TTextAlign.Center;

But if I add a comment or Object the Alignment is changed to Leading
  grd.Objects[2,2] := TObject(1);
  grd.Comments[3,3] := 'This is a comment test';

Furthermore the Comment isn't shown as it should be.
It's to small for the text (not autosizing).

Thanks...