Set selected index for ListBox
<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Use ListBox" Height="300" Width="300">
<Grid>
<ListBox Margin="10,10,10,0" Name="ListBox1" VerticalAlignment="Top" SelectedIndex="1" VerticalContentAlignment="Center">
<ListBoxItem>A</ListBoxItem>
<ListBoxItem FontFamily="Comic Sans MS" FontSize="18" Foreground="Blue"></ListBoxItem>
<ListBoxItem>C</ListBoxItem>
</ListBox>
</Grid>
</Window>
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