How to retrive values in multi listBox

Hi,

Is there a way "property" to get the value of an item that was clicked in multi listBox?

This is what I am trying to do. I am creating 2 listboxes. The first one is the main listbox. When the user clicks on any value on the main listbox. The second listbox will populate the values associated with the selected values in main listbox. If multiple selections were selected, it will populate the values in the second listbox (real-time) based on main listbox. If any unselected in main it will remove the values in the second listbox that are associated with the unselected item in main Listbox. Example:

AA= 1, 5, 3
BC= 2, 7, 9
XL= 4, 21, 61

Main Listbox:
AA
BC
XL


If the user clicked "BC" in main. Second list it should populate "on-click"

2
7
9

Then the user clicked "AA". Second list it should populate "on-click"

1
2
3
5
7
9

Then the user clicked (unselected) "BC". Second list it should populate "on-click"

1
3
5

Thank you Mike. It works good. One thing though, it is showing the values of ListBox2 in Listbox1 (Some of the Listbox2 values are over 10 values). Is there way to hide them?

Thanks again. That is exactly what I am looking for