ActionScript 3.0 :: Add Element To A View Of A Mobile Application?

I have a program with a list of item. An item is an actionScript class that extends View. When I click on the list, it push the view. In the constructor of this class I add some buttons and I have a function that add another button. My problem is that the view display only the button create in the constructor and not the one create in the function.

The class

Code:
package
{
import spark.components.Button;

[Code]....