Vaguest of memories of seeing this before...

A utility program, SDI. Nothing but a button on a dbview. I add a second button, no problem.
However if I make both buttons from my subclassed button so that I can add longer text the program throws an error.
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Obviously I can work around this with regular buttons but I'd like to know what's going on for my own education.

Here's the class
Use rgb.pkg
Use Windows.pkg

Class cMyButton is a Button
    Procedure Construct_object
        Forward Send Construct_Object
        Set TextColor to clBlue
        Set FontWeight to 400
        Set Skip_State to True
        Set Focus_Mode to Pointer_Only
        Set MultiLineState     to True