Applescript: user data item of canvas
 

Within the OG interface I can select a canvas and then provide some user data items for the canvas. However, I can not access this information via applescript like I do with an object.

Is this a bug, or am I doing it wrong?

[code]

tell application "OmniGraffle Professional 5"
tell document 1
tell canvas 1
tell graphic 1
set myKind to value of user data item "myKind"
display dialog myKind
-- works with appropriate user data
end tell
end tell

tell canvas 1
set myClassification to value of user data item "myClassification"
display dialog myClassification
-- OmniGraffle Professional 5 got an error: Can’t get user data item "myClassification" of canvas 1 of document 1.
end tell
end tell
end tell
[/code]

In the OmniGraffle applescript library, graphic objects have a [I]user data[/I] property, but the canvas does not.