Hi Eric,

thanks for you reply :)

I know Lparameters is needed to pass variables
I only want to use the following code to show a shape which can be clicked, but it gives "unknown member DETECTOR"..
May I ask what is the problem with it? How can I fix it?

define class MyRoom as container
  procedure Init
    this.addobject("Detector", "MyShape")
  endproc

  procedure Detector.click
    wait window "You clicked me!"
  endproc
enddefine

Thanks a lot!