The GetDesignModeState method returns design-time data for a control.
Notes to Inheritors:
The GetDesignModeState method returns a null reference (Nothing in Visual Basic) by default. You must override this method to provide the design-time data your control requires.
Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.