Hi Mark,
Thank you for posting query to us.
You can add a RecordFilterDescriptor to the TableDescriptor's RecordFilters collection and filter the boolean values using the LIKE operator. Below is the code snippets:
RecordFilterDescriptor rfd = new RecordFilterDescriptor();
rfd.Expression="[BoolColumn] LIKE 'False'";
this.gridGroupingControl1.TableDescriptor.RecordFilters.Add(rfd);
Please refer the sample which implements the above said feature:
http://websamples.syncfusion.com/samples/Grid.Windows/F71775/main.htmKindly let us know if you need any further assistance.
Best Regards,
Jeba.