Implementing a combobox

One thing I really think should be added to a combobox, is a menuTitle property, that displays a directive to a user such as "Select A City", or "Select A Color".

What I mean is this: If you set a combobox's datasource property to a dataset, you use a directive to display to the user since it does not exist in the dataset.

Now, some would say, just add "Select A City" to the dataset, and check for it to prevent errors, but that's not really practical when you need to pump out 45 forms.

But it is practical if you do inside the control itself. So, I need to create an Inherited combobox, that will somehow do a switcheroo.

In case I haven't been clear...
If you have four items in a dataset, how would you reset the combobox to display "Select An Item". And while its displaying "Select An Item", its selectedindex=-1. So if the user selects an item, then decides to deselect it, they can simply select "Select An Item", and I as a programmer know they have not entered a selection from that combobox.-------+

That sounded confusing, may be I can explain it better with a simple project.... when it loads, it sets the combobox to -1, but when you press the button to reset the combobox, it simply selects an item in its list (usually descending until it hits the first element, but never reverts to unselected.)