Overridden to prevent focus from ever being set on the WebPartManager control, because it has no user interface (UI).
Assembly: System.Web (in System.Web.dll)
A caller tries to call the method, which is not supported in a control that has no UI.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.