Hi Adam,
Thanks for the interest in Syncfusion products.
#1.You can use the ResizeToFit method and can make the widths of the column automatically grow as the size of the text of control increase. Please refer the following code snippet that shows how we can set ResizeToFit.
this.gridControl1.ColWidths.ResizeToFit(GridRangeInfo.Cols(1,5));
#2. Please try setting the header of the text as following code.
this.gridControl1[0, 1].Text = "This is Header";
Please refer the following sample that illustrates the #1 and #2.
http://websamples.syncfusion.com/samples/Grid.Windows/F73359/main.htmIf you still find the #2 issue (replace the text with "A") in the above sample, could you please try to reproduce the issue in this sample so that we could sort out the cause of the issue and provide you a solution?
Please let me know if you have any questions.
Regards,
Asem.