Adding Properties to a Frame descendant

I'm pretty new to Delphi even though I used to use it many years ago (ver 2) so the Frame concept is something new to me. I understan开发者_运维知识库d that they work simular to Forms in that that they have an associated DFM file and are an easy way to create components (without actually creating a component, I do understand the difference between a component and a frame). I created a simple Frame and wanted to add a property to it, however I thought that property would show up in the Object Inspector when I placed the Frame on a Form but it didn't. My question is why it doesn't?

The frame would also have to be registered in the IDE for properties to show in the object inspector, see:

Registering a custom Frame