Here is a full subject story http://www.dsource.org/forums/viewtopic.php?t=228

I attached the archived source for the 'simplified DWT' version what was stripped from the real DWT for eliminatig the problem of  D compiler.

The archive has a three version of the same widget classes.

Source folders in it are
\src_fine - is tweaked version. It doesn't have any errors and can be
linked.
\src_crash - crashes the DMD 0.94 and previous versions too
\src_f_ref - gives the forward reference. I can say error description is far
from the clarity and as for me it doesn't give a clue for solving the
problem.

The main difference between those three sources can be found in the control.d and widget.d files. The 'private import' directive position is really make sence.

Hope the source will help you Walter to fix a bug because DWT stuck with it and can't efficiently go further.

Regards, Yuriy.