The button is not a form class (it is an instance of a button class), so it can't see the hidden method. Only the instance of the form class can see it.

>I posted a similar question not too long ago, and I still do not understand why this
>doesn't work.
>
>If you look up 'Class Member Protection and Hiding' in the help, it states:
>
>

>Properties and methods in a class definition are Public by default: code
>in other classes or procedures can set the properties or call the methods.
>Properties and methods that you designate as Protected can be accessed only
>by other methods in the class definition or in subclasses of the class.
>Properties and methods designated as Hidden can be accessed only by other
>members in the class definition. Subclasses of the class cannot "see" or
>reference hidden members.
>

>
>
>So then, since everything below is part of the 'Class Definition', why then does
>this not work?
>
>The help text above says "Properties and methods designated as Hidden can be
>accessed only by other members in the class definition"
>
>The button is a member of the class definition, and should be able to
>call the hidden method on the form.
>
>
>

>oForm = CREATEOBJECT('frmMyForm')
>oForm.Show(1)
>
>
>DEFINE CLASS frmMyForm AS Form
>
>	AutoCenter = .T.
>	
>
>	ADD OBJECT cmdOk AS CommandButton;
>            WITH Caption = 'Test'
>
>
>	PROCEDURE cmdOk.Click
>
>    	    This.Parent.Hidden_Method()
>
>        ENDPROC
>
>	PROCEDURE cmdOk.Init()
>		
>		WITH This
>		
>		    .Top = 10
>		    .Left = 10
>		    .Height = 25
>		    .Width = 75
>	
>		ENDWITH
>		
>	ENDPROC
>
>	
>	
>	HIDDEN PROCEDURE Hidden_Method()
>	
>	    MESSAGEBOX('Here we are')
>	
>	ENDPROC
>	
>
>ENDDEFINE
>