Adds the provided element as a child of this element.
Assembly: PresentationFramework (in PresentationFramework.dll)
This method can throw an exception if called at a time when the logical tree is being iterated by another process.
Most FrameworkContentElement derived classes expose dedicated collections that are responsible for containment (for example, Inlines on the Span class; Blocks on the Section class). You can typically avoid any need to manipulate the logical tree directly if you derive from these classes instead. Working with the logical tree for content elements is an advanced scenario that may require a specialized parser or a specialized FrameworkElement that acts as the parent rendering element (content host).