Inserting an End Named Child for a Message Form Component

To insert an end named child for a message form component:

In the UIX Visual Editor of the desired file, right-click the message form component in which you wish to insert an end named child and choose Show end Named Child.
In the Component Palette, drag and drop a component (e.g., button) to the end named box.
In the Property Inspector, set the attributes for the end child component.