Layout DXL Editor

Hello,

I'm trying to create a DXL Layout editor the would allow me to create my code in a richText dialog; then when inserting it into a column it would convert any richText into the proper DXL code. I'm having trouble applying formatting to more the one portion of a text/line. I would also like to convert the DXL code back into rtf for the dialog. Any help would be appreciated. Thank you.