If partial classes are commented by XML doc strings, then the C# compiler will append the text of documentation into one paragraph. So make sure you use <para/> before or after your comment string. For example,
/// <summary> /// <para/> /// Yadda Yadda Yadda /// </summary> partial class PageMarginsDialog : Window { //... Your code here }
… I did’nt know this before. Cool!