Distinguishing textblock/data type in an edit events

@felix wrote:

Hello,

my nodes look like this:

------------
| Title    |
| items[0] |
|   sub[a] |
|   sub[b] |
| items[1] |
|   sub[a] |
------------

The title, and each of the variable number of items and subs, is made up of an editable TextBlock. Depending on which kind of TextBlock is edited, I want different consequences.

When the Title is modified, I want a call titleModified(nodeKey).to happen.
When an item is modified, I want a call to itemModified(nodeKey,itemKey).
When a sub is modified, I want a call to subModified(nodeKey,itemKey,subKey).
(I know how to find subKey and itemKey given the part in which the TextBlock that was edited sits.)

How can I easily detect whether a title, item, or sub TextBlock was modified, using a listener?

I didn't find a textEdited property for the TextBlock where I can assign an event handler. Is there one?
The TextBlocks all use .makeTwoWay(), so I could set a different backConverter for each. But this is ruled out by the documentation:

Conversion functions must not have any side-effects other than setting the source property.

I am currently using the textEdited listener on the diagram, but it's hard to evaluate what kind of textblock the event came from. If I could assign category:"title", category:"item" or category:"sub" to my TextBlock, the problem would be solved, but I cannot see such a possibility.
If it's possible to do this using a ChangedEvent (presumably using a modelChange of type nodeDataArray), what is the pattern for doing so? This is my least-preferred solution, since I find filtering through hundreds of changes in the transaction until I've found the right one unintuitive -- and the functions titleModified itemModified subModified make further changes to the model, so I have to queue the changes to happen after identifying those necessary changes in a transaction.changes.each call; I only know how to organise this in awkward ways.

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