>>>Container class. During runtime, I want to check if a property exists on the parent form and add it if it does not. I know I can use AddProperty(), but how to check if it's already there? Thanks!
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>>Use PemStatus().
>
>There's really no reason to check, since addproperty() will function anyway.

Unless the value is supposed to be different, i.e. if you're adding a default value post festum.

Assume you want to show some data about a motherboard, and have several fields which didn't exist on ancient motherboards (like number of fans, newer kinds of slots, *ATA drive slots, USB slots... none of that existed in '90, right?). So instead of complicating your display with various checks "if .Property42 is absent, display 'n/a'", you may want to just do it at a lower level, where you build an object to pass to display. And you just check for any such missing properties (build a list of words and just parse it), and add a "n/a" for any missing one, and off you go. Can be done in four lines.