Connecting named range with ComboBox

Hello,
I've got following problem. I want to make simple Combobox with two dropdown lists throwing me back cells values, but I never made that so I've got a little difficulties.

The sample combobox should look like this:
Clipboard01.png

For the left Dropdown list there's defined name of the range "ITEM1", and for the second - range named "ITEM2".
After user will choose something I want to have numbers of the items selected from the lists in cells "A1" and "A2", and run a macro after clicking OK. How can I do this?

Thanks in advance for help!

Regards