TWebAccordion: Enable/Disable Sections at runtime

How can sections of an accordion being enabled or disabled (or showed/hided) at runtime?

There is at this moment not really a built-in way to enable/disable a section (also not sure what exactly you expect with enabling/disabling a section).
You can programmatically hide/show a section by toggling the property:

WebAccordion.Sections[index].Expanded := not WebAccordion.Sections[index].Expanded;

I like to Enable/Disable the buttons (of a section), so the user can see there are more items, but not currently available (depending on runtime conditions).

At this moment, there is no such feature built-in. We will consider this for a future version.