Design-mode refers to the design-time property browsing, prototyping, and manipulations of integrated development environments (IDEs). When the component is living in this environment it may behave differently than it would in run-time (as far as looking for live, dynamic data sources, for instance). This indicator facilitates identification of design-time from run-time environments.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2