>Is it possible to add a property to a pageframe, or for that matter, any object, just as you can for the form?
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At design time you can add properties only to the outermost container. If you are designing form than you can add properties and methods to the form only. You can subcluss pageframe, add required methods and properties to the new class and than add that class to the form. At runtime you can add properties to any object that has AddProperty method.