Hi Tomio,
To achieve this, you need to implement a custom filterbar cell deriving the cellmodel / cellrenderer from GridTableFilterBarCellModel / GridTableFilterBarCellRenderer. Please refer to the following Kb for more details,
http://www.syncfusion.com/support/kb/666/How%20do%20I%20hide%20theSample can be obtained form the following link,
http://help.syncfusion.com/samples/kb/grid.windows/GGCRemoveCustom/Custom.zipPlease let me know if this helps.
Regards,
Jisha