I have a bunch of XBL widgets that works as a "wrapper" for content I want repeated in a <template/>. To do this I insert the child elements under the wrapper-widget and use code in <xbl:constructor/> to remove, mangle and massage the children into the complete widget. Maybe you could do something similar, i.e. put the <textbox/> inside a binding and use the constructor "opportunity" (to execute code before rendering) to poke inside the textbox and add whatever stuff you need to the context menu.
Your problem is probably a bug in the <textbox/> widget though, while my cases are mostly hacks to accomplish "special" functionality.
Example:

			<drichlistbox 

id			=	"pubList"

formElement	=	"true"

tabname		=	"pubepisode"

query		=	"SELECT p.episodeID,DATE_FORMAT(p.start,'%e %b, %Y') as start,DATE_FORMAT(p.end,'%e %b, %Y') as end,c.title FROM pubepisode as p,channel as c WHERE p.newsitemID=dbrecord AND p.channelID=c.channelID ORDER BY p.end DESC"

idCol		=	"episodeID"

maxheight	=	"110"

minwidth	=	"300"

flex		=	"1"

attendvalue	=	"true"					>

<description 			value="rdf:http://www.iperbole.bologna.it/rdf/pubepisode#title (rdf:http://www.iperbole.bologna.it/rdf/pubepisode#start - rdf:http://www.iperbole.bologna.it/rdf/pubepisode#end^)"

id="start" 

dbcolumn="start" 

flex="1"

/>

<button label="just a button"/>

</drichlistbox>

The above would result in a list of <description/>s (one for each result row in the db query) with a button alongside.

Posted by David Palm at October 19, 2005 3:13 AM