This is a conformation of a Bug ID: NOSS-8RGNGX noted here: http://www.openntf.org/projects/pmt.nsf/0/252a1364c81a002286257931006a3141!OpenDocument
When attempting to use a computed title within the Extention Library Dialog control I receive the following error:
Element type "xp:label" must be followed by either attribute specifications, ">" or "/>".
An additional symptom in my custom control is the message:
<strong>"Error generating custom visualization for this control. Markup validation failed. Ensure source is valid or contact owner.*"</strong></div>