Apache – Flex VideoDisplay text quality

Here's another way to solve it, which is simpler and it seems to work quite well for me.

myFLVPlayback.fullScreenTakeOver = false;

The fullScreenTakeOver property was introduced in Flash Player 9 update 3. The docs are all a bit vague, but there's a bit more info here:

Using the FLVPlayback component with Flash Player 9 Update 3

To change the IsSelected property of the ListBoxItem, you need to change the ListBox.ItemContainerStyle. See here:

<ListBox Grid.Row="1" Grid.ColumnSpan="3"
                SelectionMode="Multiple" VerticalAlignment="Center" 
                ItemsSource="{Binding Answers}">
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
        </Style>
    </ListBox.ItemContainerStyle>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding IsSelected}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Since the binding mode is TwoWay, selecting and deselecting the ListBoxItem's dynamically changes the content of the items to display either True or False.

Also notice how I changed the ListBox.ItemTemplate into a TextBlock instead of a ListBoxItem. The ItemTemplate defines the content of the ListBoxItem, so some type of content control is typically used. Below is the UI structure for the different layouts (this can be viewed using the WPF Tree Visualizer).

ListBoxItem as the ItemTemplate:

TextBlock as the ItemTemplate:

Edit

Also note that I removed the IValueConverter. Since your source and target properties are both bool, there is no need for a converter in this case. Try removing the converter references to see if that fixes the problem.