How to make a listbox selected item highlight color from code the same as if user click on item?

Hi all,
I have a listbox that gets filled with data when my program starts. I save the last selectedItem value so I set it when the program start again. But the color that the selected item has is not the same as if the user click on it (pictures below).
The color when I set the selectedIndex=someItem is black on light grey (background)
The color when the user clicks on the item is white on blue (background)
Any way to make them both white on blue (background)?
Thanks
This is the user clicking on it:
This is the code:

I think the difference is focus. When you use the mouse to select it also sets focus to the listbox so you would have to set focus to the listbox when you set the selected item. How are you setting your selected item? I think that by
using a property to hold the selected item rather than setting the index that might also fix the problem.
Lloyd Sheen

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