The Visible Children property specifies the list of visible child elements. The Visible property specifies whether the element is visible or hidden. The Children property specifies the list of child elements. Use the Parent property to change the element's parent. The AllowInsertChild property of the Element object specifies whether the element supports adding child elements at runtime. The AllowChangeParent property of the Element object specifies whether the element can change its parent at runtime. The ParentChangeElement event occurs when the element's parent is changed.