How do i set the combobox items to another without changing the order of the values?

[_global.kevin]

this is probably a real simple one but I’m being a right doughnut at the moment and have a mental block.

ive got a comboBox with around 10 values.
as it stands it loads showing the first value as default

How do i set it to another without changing the order of the values?

thanks

[alernon]

myComboBoxInstance.selectedIndex = 4;

[_global.kevin]

I’ve tried that and its has no effect,

I’m using an mx ComboBox in case that makes a difference.