Grid scrollbars issue even if set both, when AutoGenerateColumns = true and many columns

Hi!
Sometimes scrollbars doesn’t shows, when grid size is small (in my case 317×164), and many dinamic columns (AutoGenerateColumns = true), and ScrollBars=Both.

My code is like:
gridResults.DataSource = dataTableWithManyColumns;
gridResults.Columns[0].Visible = false;
gridResults.Focus();
if(dataTableWithManyColumns.Rows.Count > 0)
gridResults.Rows[0].Selected = true;

If I deselect all columns (in checkboxes menu), and reselect one by one, scrollbars finally shown.
Any advice to force scrollbars to show, or is a bug?

I try but no success with:
gridResults.Refresh();
gridResults.Update();
gridResults.PerformLayout();
gridResults.AutoScroll = true;

Thanks in advance!

Using version 1.3.23