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Called whenever the control's template changes.
Assembly: PresentationFramework (in PresentationFramework.dll)
The timing for changing the template is as follows:
The template is changed by a SetValue method call, a style trigger, or some other means.
The property value changes; the property-changed callback is called.
The old visual tree is removed.
An internal method is called which eventually calls the method.
Later, during a measure, OnApplyTemplate is called and a new visual tree is attached.
Windows 8 Consumer Preview, Windows Server 8 Beta, Windows 7, Windows Server 2008 SP2, Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)