Controls, properties, and events reference
Blend for Visual Studio 2012 is an interactive design tool. In Blend, you can design an application visually on the artboard by drawing objects and controls; importing images, audio files, video files, and 3D objects; animating and styling objects; and displaying data.
The controls that appear in the Assets panel of Blend come from WPF(Windows Presentation Foundation) or Microsoft Silverlight assemblies. Most of these assemblies are installed with the Microsoft .NET Framework or Silverlight. Some might be .dll files that you have downloaded and referenced in your project.
WPF assemblies
You can view detailed information about the controls that come with WPF assemblies, including information about their properties and events, at the following locations on MSDN:
The System.Windows.Controls Namespace section of the .NET Framework Class Library, which provides detailed reference topics for controls, their properties, and their events.
The Windows Presentation Foundation Control Library section, which lists common controls and includes basic how-to topics with code and XAML examples.
Silverlight assemblies
You can view detailed information about the controls that come with Silverlight assemblies, including information about their properties and events, at the following locations on MSDN:
The System.Windows.Controls Namespace section of the .NET Framework Class Library for Silverlight, which provides detailed reference topics for controls, their properties, and their events.
The Silverlight Control Gallery provides screenshots and descriptions of common controls.