I've read up on binding to other classes but the syntax is tripping me up.

I have properties in my MainWindow.xaml.cs and I'd like to reference them SecondWindow.xaml.

I tried {Binding Source={x:Static local:MainWindow.Test}} but it complains about Key being null.

I've read up on binding to other classes but the syntax is tripping me up.

I have properties in my MainWindow.xaml.cs and I'd like to reference them SecondWindow.xaml.

I tried {Binding Source={x:Static local:MainWindow.Test}} but it complains about Key being null.

Update

Following the suggestion, I set the SecondWindow context to my MainWindow as well as tried setting the ParentHandle.

When the application runs, I get a bunch of runtime errors like this.

System.Windows.Data Error: 40 : BindingExpression path error: 'LabelColor' property not found on 'object' ''SecondWindow' (Name='secondWindow')'. BindingExpression:Path=LabelColor;