In order to track the activity in Solution Explorer, you can turn that option on or off by going to Tools > Options > Projects and Solutions, and making that selection. However, sometimes you may want to be able to easily toggle that switch.
You can do that by adding a custom toolbar in Visual Studio by following these steps:
1) Create a New Toolbar, and give a name like "Track Activity"
2) In Customize window, under the Commands, select "Track Activity"toolbar
3) Add Command under the controls, and choose "View" under Categories and "Track Activity in Solution Explorer" under Commands.
