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I have an owner-drawn listbox control.
The problem is that sometimes the DrawItemEventArgs argument passed to my DrawItem event-handler has an Index property of ‘-1’. This is my unethical fix:
private void lstBox_DrawItem(object sender, DrawItemEventArgs e) { if (e.Index >= 0) { handler implementation } } I’d like to know what normally causes a negative index to be passed to the handler.
This may be when the listbox is empty, but receives the focus – e.g. if the list is cleared on closing.