When you add (for example) WPF window to your project VS creates .xaml and .xaml.cs files. However they are not displayed in a flat list in VS Explorer, rather .xaml.cs is a child file (in terms of the tree) of .xaml file.
How to organize several "custom" files into such tree? For example I have Trainer.cs file and Trainer.Builder.cs file. I would like Builder to be displayed as a child of Trainer.cs file. How to do it?
Please note: I know about folder with files, but I don't want to use it, because in such case even the "main" file is hidden and I have to unfold folder to get it.
Update
While searching for difference between VS2008 and VS2010, I found out, that my entire question is a duplicate of SO question -- there you find how to fix a fix for VS2008 to work with VS2010 :-)