[Seaside] Running Seaside "allcanvastests" in Seaside 2.6a2 produces "Message not understood: #includes:" in VisualWorks

[Rick Flower]

Hi all.. I was seeing this issue with my code and happened to try out 
the "allcanvastests" example and found it gives the same
error if you press any of the buttons after the initial page comes up.  
Below is a partial stackdump.. Is this something I'm only seeing
or is this perhaps an issue with 2.6a2?  Anyone have any ideas on whats 
missing/wrong?

Thanks!

Debug Full Stack
Message not understood: #includes:

UndefinedObject(Object)>>doesNotUnderstand:
self    nil
temps
aMessage    a Message with selector: #includes: and arguments: #('form')
excpt    a MessageNotUnderstood
resumeValue    nil
Seaside.WAHtmlStreamDocument(Seaside.WAHtmlDocument)>>isWithinTag:
self    a Seaside.WAHtmlStreamDocument
temps
aString    'form'
inst vars
root    a Seaside.WARenderedHtmlRoot
state    #body
stream    a ReadWriteStream
Seaside.WAFormTag>>isWithinForm
self    a Seaside.WAFormTag
temps
inst vars
parent    nil
canvas    a Seaside.WARenderCanvas
isClosed    nil
attributes    a Seaside.WAHtmlAttributes
defaultAction    nil
Seaside.WAFormTag>>with:
self    a Seaside.WAFormTag
temps
aBlock    BlockClosure [] in Seaside.WACanvasInputTest>>renderContentOn:
inst vars
parent    nil
canvas    a Seaside.WARenderCanvas
isClosed    nil
attributes    a Seaside.WAHtmlAttributes
defaultAction    nil
Seaside.WACanvasInputTest>>renderContentOn:
self    a Seaside.WACanvasInputTest
temps
html    a Seaside.WARenderCanvas
inst vars
decoration    a Seaside.WAStateHolder(a Seaside.WACanvasInputTest)
nilString    nil
emptyString    ''
integer    42
fraction    (1/3)