Ah! I found the solution...
BlockUIContainer
hasChild
which in return can contain everything else (as long as it inherents fromUIElement
)- It's called
Inlines
on aParagraph
. This returns a collection ofInline
. - For
List
its calledListItems
. This contains a collection ofListItem
(which in return containsBlocks
, thus either of these. - A
Sections
also containsBlocks
Table
hasRowGroups
which has a collection ofTableRowGroup
, etc. etc. etc.
I've been dumb not to think about the ContentPropertyAttribute
...