There is just one condition in the rDBGrid_FilterCondForm, you can check the source code:
procedure TrDBGridFilterCondForm.InitCond(DBGrid: TDBGrid; DisplayField: TField);
...
chCase.Visible:=RosiCompConfig.rDBFilterCfg.ShowCaseSensitive;
...
I'm sorry but I cannot help more without your source code.
Tomas