I also added a cancel button to the resize dialog in worldbuilder (GvR).
The user has build some world and then hits the resize button, he must destroy
the window to save his work :-(
When he hits OK, the world is cleared.
By adding a Cancel button we avoid this.
(The Cancel button is connected to the OnCloseWindow method)
"Everything that is really great and inspiring is created by the individual
who can labor in freedom."