@Jim, sorry that no one from the core group got on this earlier. I had some time to look into this and it is Composite C1 that is the guilty part, not TinyMCE.
I've submitted a fix for this issue to our source code (which is now on GitHub) and if you want to see the needed core code changes, you can see them here:
https://github.com/Orckestra/C1-CMS/commit/c31c07f12fc05d083ec47646f464ee3908d5bc0a
There really is no easy workaround for the 4.3 version without changing the source code as shown in the above checkin.
So you will have support for this in our upcoming v5
I've submitted a fix for this issue to our source code (which is now on GitHub) and if you want to see the needed core code changes, you can see them here:
https://github.com/Orckestra/C1-CMS/commit/c31c07f12fc05d083ec47646f464ee3908d5bc0a
There really is no easy workaround for the 4.3 version without changing the source code as shown in the above checkin.
So you will have support for this in our upcoming v5