changes to MainWindow.
changes to MainWindow.

(ResumeWatchDirectoryChanges): new method.

made current position methods public.

(CanExecuteExtract): new code-behind method for xaml widgets.
(CanExecuteDelete): renamed into CanExecuteOnPhysicalFile.

(ExtAutoCompleteBox.OnPopulating): capture trown exceptions.

dsp2003/GARbro,morkt/GARbro,morkt/GARbro,dsp2003/GARbro,dsp2003/GARbro