Hi Scott,
Thank you for using Syncfusion products.
You can set MonthCalendar by using CellType property of GridControl. Below is the code snippet:
this.gridControl1[5, 2].CellType = GridCellTypeName.MonthCalendar;
Please refer the sample available in the link below and let me know if it helps:
http://websamples.syncfusion.com//samples/Grid.Windows/F71899/main.htm Regards,
Subhasheela R