dwt-samples\jface run time Exception: Attempt to include invalid key _in Collection

[yidabu]

only ShowFieldPrefs.d builds and runs ok, other samples cause run time error:

tango.core.Exception.IllegalElementException: Attempt to include invalid key _in
 Collection

what's the issue ? how to fix this?

tested with DMD 1.028, Tango svn, dwt svn, dwt addons svn.

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