Use the Dynamic Views page of the Options window to control whether the system notifies you when new file versions are added to a shared branch.
Whenever a file is opened by Visual Studio, the IDE detects changes made outside the environment and prompts users to reload changed files. However, Visual Studio cannot detect changes made in a dynamic view, except at checkout time. To avoid the potential issue of working with files that do not reflect the latest changes, enable the Poll for background file changes option.
For example, if you have a code file open that has been modified by another developer and the Poll for background file changes option is selected, Visual Studio prompts you to reload the file so that you are working with the latest changes. You also avoid the risk of building and testing against files that are different from those displayed in the editor window.