InfoPath Dev

I have a listbox (listBox) and a dropdown list(dropDown).  I want to be able to select an item from the dropDown and add them to the listBox.  I have looked everywhere for this but all I ever see is adding data from a datasource instead of a dropdown.  I want this to be dynamic so the listBox is populated based on the a user selected in the dropDown.  The code I have is:

 Sub btnGo_OnClick(eventObj) 

     dim field1 as XPathNavigator = xDocument.DOM.selectNodes("//my:listbox") 

     dim newNode as XPathNavigator = field1.Clone()  

     set objXMLNodes = XDocument.DOM.selectNodes("//my:myFields") 

     mytext = XDocument.DOM.selectSingleNode("//my:dropDown").text 

     temp = msgbox(mytext, vbok)                                      'so I can see, yes I am getting data from the dropdown to add to the listbox

     newNode.SelectSingleNode("value").SetValue(mytext) 

     newNode.SelectSingleNode("displayname").SetValue(mytext) 

     field1.appendchild(newNode)

End Sub

you cant just go and add items to dropdown or listbox at run time like we do in .net.

we have to bind the listbox to a repeating table and when u want to insert one more item to the listbox insert it into the repeating table and it will reflect in the list box since it is bound.

ok, so what I have done is put the dropdown in a repeating table that I can parse through.  Is there a way to add a button to a column in the repeating table that will delete the associated row?