Hi Stanley,
Thank you for posting your query to us.
I am afraid that I was not able to reproduce the issue.I have created a simple sample to test this issue.
Here is the code snippet
//Give the index of the column you want to hide
this.gridGroupingControl1.TableModel.Cols.Hidden[2] = true;
Please refer the sample that illustates the same:
http://websamples.syncfusion.com/samples/Grid.Windows/F68384/main.htmPlease have a look at the above sample and if still the issue exists, could you please try reproducing itin the above sample or send us the reproducing steps so that we could sort out the cause of the issue
and provide you a solution?
Regards,
Jisha