Visual Studio auto opening collapsed properties

Here is my problem. I have a C# class file loaded in Visual Studio that I am working on. I made a class and created some properties inside of said class. I collapsed the properties like so: I collapse the properties with the little `+`/`-` button on the side of each. I want to collapse each of them since I have a lot of other classes with properties and I don't want to see a lot of repetitive code (get, set). Closing them works fine but after I work on some other classes in the same file the properties re-open so I can see the code: This happens relatively often and is quite annoying. I have a lot of lines in the file and I sometimes have to work with a small screen. Is this a glitch/bug or something else? (I am using Visual Studio 2010 C# Express) Thanks for your help.