[RESOLVED] ListBox error using SelectedIndex

[AlphaScorpious]

I'm having a problem with setting a ListBox's SelectedIndex from a sub.

I fill the ListBox with 8 items during Form_Load(). Once it's loaded, I select the index for the listing I want selected:

ListBox1.SelectedIndex = MyIndex, with MyIndex being an integer from 0-7.

Everything is fine until I try and change the selected index from any sub I create using the same code: ListBox1.SelectedIndex = MyIndex. When I do, I get this error:

ArgumentOutOfRangeException was unhandled
InvalidArgument=Value of '0' is not valid for 'SelectedIndex'.

I doesn't matter if I use any value of 0 to 7, I get the same error. If I use -1, then it's fine; no selection.

What's weirding me out is that I can run the exact line of code from a button's Click event and it will work.

What am I missing?