[DUG]: Determining if Object Implements an interface

[Neven MacEwan]

Hiya All

I've just started 'playing' with interfaces and I want a proc to 
interate over a list on objects and if they implement and interface call it

But I've run into a brick wall

using 

with combo as IanInterface do 

all I get is  'Operator not applicable to this operand type' 

ie. What it the equivalent of 'is' for an interface

Regards
Neven





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