Hi Randolph,
Thanks for your interest in Syncfusion products. And I apologies for the delayed response.
You can achieve your requirement by using 'Document' property of HTMLUI control. For more information I have include the Document link as follows.
[Document Link]
http://help.syncfusion.com/ug_84/User%20Interface/Windows%20Forms/HTML%20UI/Documents/howtogetanobjectforthecontrolpresentinanhtmlelementinthehtmluicontrol.htmRegards,
Iniyen M.A.