Make XAML a first class citizen of Visual Studio
Make XAML participate in compile time syntax checking, in code refactoring (e.g. property renames), and in code navigation. Add refactoring (e.g. "Create Style from Element") and other performance features to the XAML code editor (e.g. allow in-place editing of xaml tags so that the end tag changes when you change the begin tag).
Many new improvements have been added including in-place editing of XAML tags. We are actively looking into refactoring improvements.
Here are the links to some of the related uservoice items. Please vote for the improvements that you would like to see next!
XAML refactoring to UserControl, DataTemplate, ResourceDictionary - https://visualstudio.uservoice.com/forums/121579-visual-studio-2015/suggestions/2190335-support-xaml-refactoring-to-usercontrol-datatemp
There are many improvements to the way Visual Studio handles XAML in Visual Studio 2015.