I will try to explain the situation as much as possible, feel free to ask any questions If you need further info.
I'm using the following project: https://github.com/ButchersBoy/MaterialDesignInXamlToolkit
It contains the demo, I'm simply trying to copy the demo into my own project. So far, I'm doing good but I stumbled upon an issue. I'm using ReSharper Extension and It gave me an error (under "DemoItems" on the second line):
Code:
PreviewMouseLeftButtonUp="UIElement_OnPreviewMouseLeftButtonUp">
The error message (I can compile but nothing fills the Listbox): Cannot resolve symbol "DemoItems" Due to unknown dataContext
The file in question is MainWindow.xaml: https://github.com/ButchersBoy/MaterialDesignInXamlToolkit/blob/master/MainDemo.Wpf/MainWindow.xaml
If you're good, I believe you won't even need to download the source code.
The weird thing here is that I downloaded that demo source code, I have the same error messages there, but when I compile, the Listbox gets filled with data and that's not the case for my application.