ListBox selected index color wpf

I am just starting with WPF and I have this ListBox that displays an attribute from a class I made. I have to programmatically change the selected index, when I do something like:

ListBox1.SelectedIndex = 4; 

the SelectedI开发者_开发知识库ndex is changed and highlighted gray, but if I click on it, the selected index is blue. Is there something else i need to do to have both behave the same?

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Sounds like the focus is not on the ListBox. Try ListBox1.Focus() after changing the SelectedIndex.