Gets or sets the default value of the dependency property.
Assembly: WindowsBase (in WindowsBase.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
is defined in the object model as read-write. This is so can be adjusted after initialization of the PropertyMetadata object itself. However, once the metadata is consumed as part of a call to Register, AddOwner, or OverrideMetadata, the property system will seal that metadata instance and the properties are now considered immutable. Attempting to set once IsSealed is true on this metadata instance will raise an exception.
Although it is the default per the parameterless constructor, a defaultValue of UnsetValue cannot be set using either or the constructor. Attempting to do so will raise an exception.