Yes, when an item is selected in a ComboBox, you can detect that a selection was made and what was selected, and then do whatever else to other data display objects that you need. Look in the Flash help documentation for the 'change' event to see how to detect when a selection is made/changed, and then look at the selectedIndex and/or selectedItem properties to see how to dtermine what was selected.
Thanks for the responce, however I didn't find anything. This is what I'm trying to do:
Use a Combo Box to Pre-populate Form Fields
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I realize what you are trying to do. I am really curious where you looked that you did not find anything. The Flash help documents identify all of the properties, methods, and events associated with every class, including components such as the ComboBox. Learning to use the help documents is one of the most useful things to pursue, before actually programming anything.
Here's is an example copied directly from them in the section that discusses the change event I indicated you should look into...
var listenerObject:Object= new Object();
listenerObject.change = function(
And where it says "// Your code here." is where you would make use of the comboBoxInstance.selectedIndex or selectedItem property to determine which selection was made which you could use to determine which values to assign to the other fields.