When implemented in a derived class, provides a method that returns the content control for a Web Part that hosts an external application, and optionally holds a client hash.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: No
Implementing this class is part of the process of creating a custom External Application Provider (EAP). If the external application does not require a client hash and you do not need to change the way Microsoft SharePoint Foundation renders the Web Part that hosts the application, then you can implement both the property and the method to return a null reference (Nothing in Visual Basic).