Add ResourceDictionary to class library

Question

I created a class library which is contained of WPF Windows and some user controls inherited from my c# classes that helps me to customize certain wpf controls.

Now

Answer 1

Since i can't yet comment but i've used this answer twice now:

To add to nmariot's answer:

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Tip 1

to reach the .csproj file from visual studio

right click project -> click 'unload project'

right click project [in unloaded state]-> click 'edit 'filename.csproj''

Tip 2

to avoid error warnings once resource dictionary has been added:

add reference to System.Xaml