InputMethod.ShowRegisterWordUI Method (UIElement, String)
Displays word registration user interface (UI) associated with the currently active keyboard text service. Accepts a specified string as the default value to register, and a specified UIElement as the parent element for the configuration UI.
Assembly: PresentationCore (in PresentationCore.dll)
Typically the value specified by registeredText is used to pre-populate the word registration user interface (UI).
Available since 3.0