ComboBox Title

Hello all.
I’ve been battling with my comboBox here for awhile now.
I have managed to get everything functioning great minus one feature.
This places “Chose a University” in the title of my combobox

comboBox.addItem({data:0, label:"Chose a University"});

How do I only show this in the title and not in the dropdown list?
I’ve tried


But not getting any results.
Any help on sorting this or a better way to add a title to the combobox?