Created Improvements in v4.5.1 (markdown)

Improvements-in-v4.5.1.md

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+## <a id="Community451"></a>v4.5.1
+
+_Released August 15, 2023._
+
+**9 bug fixes and improvements**
+
+* In AvalonDock, the DockingManager.PreviewDock & DockingManager.Docked events are now raised properly when docking from a LayoutContent.
+* In AvalonDock, a NullReferenceException is no longer thrown when opening a LayoutDocument as a floating window.
+* In CheckComboBox and CheckListBox, the Command is now executed when SelectAll or UnSelectAll is used.
+* DateTimeUpDown.TryParseDateTime() is now a protected virtual method.
+* In NumericUpDowns, an invalid numeric value is no longer set on the NumericUpDown when extra numeric values are added with the keyboard while a FormatString includes special characters like %.
+* In PropertyGrid, the order of the categories will now be respected when using CategoryOrder attributes in tandem with the CategoryPropertyOrder attribute.
+* In PropertyGrid, all the properties will now be displayed properly when using the categorized mode in .NET 7.
+* When getting the dlls from NuGet, the "wrong package" warning that appeared for System.Drawing.Common no longer appears.
+* In WatermarkComboBox, the focus highlight is now showed as expected when hovering over the control.
+
+We hope you love this release and decide to support the project by getting a license to Xceed Toolkit Plus for WPF.
+-- Xceed Team
+
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