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Reset a Combo

I have a Combo in a form. When it is initialized, there is nothing selected and the text is blank. It's state is:
-- The UI displays nothing
-- selectedValue = null
-- actual value = ""

If the user makes a choice, but then clicks a 'reset' button, I want to return the combo to it's original state. It seems the only way to reset the combo to it's original state is to use *3* functions:
combo.setComboText(""); -- this blanks the text in the UI
combo.setComboValue(""); -- this sets the 'actual value' to blank
cpeciesCombo.unSelectOption(); -- this sets the 'selected value' to null

Is this correct? Or is there a single "reset" function I'm missing?

Thanks