The general metaphor is to address app by full name, and then the document directly (see Calling Tinderbox), like so
tell application "Tinderbox 10"
-- add code here
end tell
Although it might make familiar sense to start addressing a general context in Tinderbox, e.g. to make a note, like so:
tell front window of front document
(WRONG!)
this generally does no work, as the Tinderbox AppleScript app Dictionary addresses notes, attributes, etc. via the host (TBX) document rather than via a specific window.
Correct is to use:
tell front document
or if multiple documents are open, address it by name:
tell document "Workspace.tbx"