I create a new class which inherit from tbrowse to replicate the setstyle of
clipper tbrowse. When I use the addcolumn method ittells me that the
parameter is not of the proper data type (error base/3). When I verify the
type of the parameter with clssname method it is effectively of type
TBColumn. Any ides of waht the problem is?

This is the new class definition I use:

class tbrsiga  from tbrowse
method init
exported
method setstyle
var tbrsty
endclass