Actually you are going down the right road and getting close. You will want to use the Enum options and create an enum with values like this:Public Enum MyBooleanEnum as Integer
No = 0
Yes = 1
End Enum
or
Public Enum MyBooleanEnum as Integer
False = 0
True = 1
End Enum
Once you have the enum, then you will assign this when setting up the SearchField. Then you will want to assign a value of -1 as the "Not Used" value for the TopMost Item (Combo - General page) which is should be by default anyway. This should work just fine as I did it the other day.