Fix not showing external dialogs inside Powershell scripts #3862
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Describe the changes you have made to improve this project
The problem here was that we don't have an application which normally holds all necessary MahApps resources. External dialogs are based on a dynamically created window that doesn't had these resources. There was also some other null pointer exceptions which are now also fixed.
Thx @damienvanrobaeys for the sample and help.
and also @JM2K69 for the help.
Closed Issues
Closes #3500
Closes #3684
Closes #3755
Closes #3861