That happens because you override the default ItemContainerStyle
which is null and setting a new style for the ListBoxItem
without a storyboard for the Selected / Unselected Visual States.
Have a look at the default styles. What you should do will be straightforward after you read the article.
EDIT
Here's an example.
<ListBox
Name="lstCourses"
ItemsSource="{StaticResource ListOfCourse}"
toolkit:TiltEffect.IsTiltEnabled="True"
SelectionChanged="lstCourses_SelectionChanged">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Grid
IsHitTestVisible="{Binding IsEnabled}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="SelectionState">
<VisualState x:Name="Unselected" />
<VisualState x:Name="Selected">
<Storyboard>
<ObjectAnimationUsingKeyFrames
Storyboard.TargetName="textbox1"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame
KeyTime="0:0:0" Value="{StaticResource PhoneAccentBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames
Storyboard.TargetName="textbox2"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame
KeyTime="0:0:0" Value="{StaticResource PhoneAccentBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames
Storyboard.TargetName="textbox3"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame
KeyTime="0:0:0" Value="{StaticResource PhoneAccentBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<TextBlock
x:Name="textbox1"
TextWrapping="Wrap"
Grid.Row="0"
FontFamily="Segoe WP SemiLight"
FontSize="25"
Text="{Binding CourseName}"
/>
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="3*"/>
</Grid.ColumnDefinitions>
<TextBlock
x:Name="textbox2"
TextWrapping="Wrap"
Grid.Column="0"
FontFamily="Segoe WP SemiLight"
FontSize="20"
Foreground="{StaticResource PhoneSubtleBrush}"
Text="Instructor: "
/>
<TextBlock
x:Name="textbox3"
TextWrapping="Wrap"
Grid.Column="1"
FontFamily="Segoe WP SemiLight"
FontSize="20"
Text="{Binding CourseInstructor, Converter={StaticResource InstructorConvertor}}"
Foreground="{StaticResource PhoneSubtleBrush}"
/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>