How to create a custom button in a Model-add-in custom tab?

[Stanislav Hrabí]

Hi

I'm trying out the model add in functionality a little more.  The example model shows us how to add a custom add-in tab via EA_OnContextItemChanged,  BuildSummary and AddPropertiesTab

So far I can use the add-in tab to create a list of values. But what I'd like to do is create a few custom buttons in the custom tab.

Could somebody give me a hint (or even better, write a piece of code) how to create a functional custom button?