Added the FloatingWindowShowInTaskBarMode.Always option, which lets floating tool windows appear in the task bar.
Updated the Prism sample's DockSiteRegionBehavior to properly remove a view from the region when a related docking window is unregistered from its dock site.
Improved system dragging over tabs to properly indicate no drop is supported, while still allowing tabs to be selected on hover.
Improved focus logic.
Improved logic for determining when a tab is about to drag in scenarios where the tab control is moved on selection due to external controls being added to the layout.
Improved XBAP support.
Editors
Added a DefaultValue property to numerous edit boxes that provides the value to set when incrementing/decrementing from a null value.
Updated edit boxes to handle mouse wheel events when their popup is open.
Grids
Improved TreeListBox's tracking of the first item to focus on focus gain.
Updated TreeListBoxItem to match other controls like ListBox and not auto-select itself on focus.
Updated property editors that use Editors' edit boxes to appear empty when the PropertyGrid is examining multiple data objects with different property values.
Ribbon
Improved Backstage tab and separator rendering.
不具合の修正
Editors
Fixed a bug where certain DataGrid column interop properties weren't being passed down to the core edit box instances properly.
Fixed a bug where DateEditBox.CanRetainTime didn't always work properly.
Fixed a bug in EnumEditBox where a data-bound flags value might not initially appear correctly in the popup.
Themes
Fixed a bug introduced in a previous build where a small border could temporarily appear when a window with WindowChrome was activated/deactivated in a certain scenario.