Hi Avi,
Thanks for your interest in Syncfusion product.
To change the color of selected cells or rows in GridGroupingControl, use the following code snippet:
this.gridGroupingControl1.TableOptions.ListBoxSelectionMode = SelectionMode.None;
this.gridGroupingControl1.TableOptions.AllowSelection = GridSelectionFlags.Any;
this.gridGroupingControl1.TableModel.Options.AlphaBlendSelectionColor = Color.Olive;
You can download the sample from the following page:
http://websamples.syncfusion.com/samples/Grid.Windows/I37014/main.htm'>http://websamples.syncfusion.com/samples/Grid.Windows/I37014/main.htm">http://websamples.syncfusion.com/samples/Grid.Windows/I37014/main.htm
Kindly let me know if you need any further assistance.
Regards,
Subhasheela R