Combo box issues

I am looking for a way to have a combo box display its dropdown programmatically. I want to do this to make it obvious that the user needs to make a choice. I have read that 'thisform.combobox.dropdown()' should do the trick but the form comes up with the proper information in the dropdown which can only be seen after clicking the control.

Another less important feature would be a way to control the position of the list of choices when the dropdown is accessed.

Any help will be appreciated,

Joe

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