Combobox expand values above?

Hi all,

is there a way to cause the combobox to show it’s list of values above the combobox, as opposed to how it normally shows.
For clarification when clicking the combobox, i want it’s values to be shown as a “drop up” instead of a drop down.

That’s the behaviour has if there is not enough space to open it down, but I don’t think that there is a readymade solution to force it to always open up.