This feature is so cool, I can't believe I missed it until now!
If you are developing WinForms controls (I'm talking about WinForms not Avalon) using Visual Studio 2005 Beta 2, configure your project to be the start up project and press F5.
Visual Studio will automatically run a form that lets you experiment with your controls. You will have the option of changing your controls properties at run time and see the effects on your control.
If you have more than one control in your project, it will even let you choose which one you want to test.
No more, do a change -> run -> stop -> another try at your change - > another run, another stop...
