fashion as in Windows Forms by directly dragging and dropping components using the Visual Studio GUI. While XAML provides drag and drop placement backwards compatibility through the Canvas Control, XAML Controls are only similar to Windows Forms Controls and are not one-to-one backwards compatible. They perform similar functions and have a similar appearance, but the properties and methods are different enough to require remapping from one API to another. Alternative implementation Mono is a project led by Xamarin (formerly by Ximian, then Novell) to create an Ecma standard compliant .NET Framework compatible set of tools. In 2011, Mono's support for System.Windows.Forms as of .NET 2.0 was announced as complete; System.Windows.Forms 2.0 works natively on Mac OS X. However, System.Windows.Forms has not been actively developed on Mono. Full compatibility with .NET was not possible, because Microsoft's System.Windows Forms is mainly a wrapper around the Windows API, and some of the methods allow direct access to Win32 callbacks, which are not available in platforms other than Windows. A more significant problem is that, since version 5.2, Mono has been upgraded so that its default is to assume a 64 bit platform. However, System.Windows.Forms on Mono for the Macintosh OS X platform has been built using a 32 bit subsystem, Carbon. As of this date, a 64-bit version of System.Windows.Forms for use on Mac OS X remains unavailable and only .NET applications built for the 32 bit platform can be expected to execute. See also Microsoft Visual Studio ClickOnce Abstract Window Toolkit (AWT), the equivalent GUI application programming interface (API) for the Java programming language Visual Component Library (VCL) from Borland Visual Test, test automation References External links MSDN: Building Windows Forms applications MSDN : Windows.Forms reference documentation MSDN : Windows Forms Technical Articles - Automating Windows Form with Visual Test .NET terminology Formerly proprietary software Free and open-source software Forms Microsoft free software Mono (software) Software using the MIT license Widget toolkits 2002 software Windows-only free software