This setting is a boolean setting. It specifies whether you can select the class that is used for a class parameter. If true, the class parameter appears in the formula parameter list as a class name and a Browse button that lets you select a descendant class as well. If false, the class parameter does not appear at all, and its sub-parameters are listed as normal formula parameters. In this case, it looks like the class parameter is replaced by its sub-parameters.
The selectable setting defaults to true, so you only need to specify it when you want the class parameter to be non-selectable. It can only occur inside a parameter block for a class parameter.
Example:
default:
MyClass param MyClassParam
selectable = false
endheading
See Also
Class parameters
Parameter blocks