I don’t think any of the tinyMCE stuff is being loaded on that page in the manager interface, i could potentially create a plugin that injects it into the header on that page but i think i might need a bit of hand holding on that one
Think i got it
Created a plugin that injects the following on OnManagerPageInit i was hoping for an event more related to when the messages CMP is loaded but its all i could find.
<link href="/assets/components/migx/css/mgr.css" rel="stylesheet" type="text/css" />
<link href="/assets/components/tinymcerte/css/mgr/tinymcerte.css?v=1.4.0" rel="stylesheet" type="text/css" />');
Then in the file at location manager/assets/modext/widgets/security/modx.grid.message.js i gave the message textarea field an id (it didn’t have one already)
Then on the “show” of the create message window i am adding RTE to the field via its ID
Obviously i updated the core file which was not ideal (luckily it was just two lines, one if the id already existed on the field) but if anyone else has any other quick way i could do the same without core modding that would be awesome