We still have some missing attached properties

• System.Windows.Controls.Validation.HasError
  https://msdn.microsoft.com/library/system.windows.controls.validation.haserror?toc=xxx

• System.Windows.Controls.Validation.Errors
  https://msdn.microsoft.com/library/system.windows.controls.validation.errors.aspx?toc=xxx

• System.Windows.Shell.WindowChrome.ResizeGripDirection
  https://msdn.microsoft.com/library/system.windows.shell.windowchrome.resizegripdirection.aspx?toc=xxx

• System.Windows.VisualStateManager.VisualStateGroups
  https://msdn.microsoft.com/library/system.windows.visualstatemanager.visualstategroups.aspx?toc=xxx

• System.Windows.Localization.Attributes
  https://msdn.microsoft.com/library/system.windows.localization.attributes.aspx?toc=xxx

• System.Diagnostics.PresentationTraceSources.TraceLevel
  https://msdn.microsoft.com/library/system.diagnostics.presentationtracesources.tracelevel.aspx?toc=xxx