Vertically align elements in different items of a listview

[simgunz]

I have a listview whose elements are rows composed of an icon, a text and a combobox. I would like to have the elements of the same type vertically aligned with the corresponding elements in the other items as in a table, while now they are all left justified. How can I achieve this?

Here's a picture of the current result:
http://i.imgur.com/ClD9aKv.png