Try this:

SET STEP ON 

oForm = CREATEOBJECT("myForm")
oForm.Show()

DEFINE CLASS MyForm AS Form

    PROCEDURE Show
	
        IF This.Height = 50
        ENDIF
	
    ENDPROC

    PROCEDURE Height_Assign
        LPARAMETERS nHeight AS Integer
        WAIT WINDOW "Height_Assign called" NOWAIT
    ENDPROC

ENDDEFINE

When the IF This.Height = 50 line is fired, the _Assign code runs. nHeight in the _Assign
is 250.

What gives?