Called to indicate that you should add (append) an element with the given subject to the container.
![](../icons/collapse_all.gif)
![](../icons/collapse_all.gif)
- subject (String)
- The subject of the element to add.
![](../icons/collapse_all.gif)
The element must be added to the end of the container. For example, if there are three elements already in the container at positions 0, 1, and 2 respectively, adding a fourth element places it at position 3.