Something like..
Code:
<DataSource Name="blah">
<Data Text="Text Displayed in the drop down"/>
<Data Text="Text Displayed in the drop down" id="1634378213" Script="what ever script u want"/>
<Data Text="Text Displayed in the drop down" id="1634378214" Script="what ever script u want"/>
</DataSource>
<DropDownBox Name="DDB" OnSelect="useability SelectedItem.id
SelectedItemIndex=0"/>
<Button OnPress="Activated=False Activated=True OnActivate=Parent.DDB.SelectedItem.Script"/>