Question : Reference option button

I have a function that will perform a task in one of three diffeernt ways depending on the selection of a radio button in an excel worksheet.  I need to be able to reference each radio button and see if it is checked or not, but I can't find a way of doing this.  I have been trying things like
If ActiveSheet.OptionButtons("OptionButton19").Value = -1 Then
If Sheets("TechnicalData").OptionButtons("OptionButton19").Value = -1 Then
but neiter of these work.  Can someone please tell me how this is done?
Thank you

Answer : Reference option button

If it's an option button from the Forms Toolbar, then the code would most likely be:

If Sheets("TechnicalData").OptionButtons("Option Button 19").Value  = 1 Then

since they default to having spaces in the name, and the value when checked is 1.