Assets panel (XAML)
The Assets panel lists all the XAML element types, styles, and media that you can add to the design surface.
The Assets panel lists all of the controls that are available in your Blend for Visual Studio project. In addition, the most recently used controls appear in the Tools panel.
You can open the Assets panel by clicking the Assets icon at the bottom of the Tools panel, or by clicking Assets on the Window menu.
The Assets panel
Search box Filter the list of assets by typing in the Search box.
Grid mode and List mode Switch between the Grid mode view and the List mode view of assets.
Assets categories Click a category or subcategory to view the list of assets in that category.
All Select to show all available controls.
Common Select to show only the Microsoft design styles available in a resource dictionary.
Category description View a description of the category or subcategory selected in the Assets panel.
You can quickly add a control to the design surface by doing one of the following: