WPF Resource Styles not showing first time - wpf

Question

When I bind my collection to the following window and usercontrol, the styles do not work.
When I press a button on the window, the styles kick in.
What is stopping my styles from firing at initial bind?
<Grid>
<ItemsControl Name="LbItems" ItemsSource="{Binding MyData}">
<ItemsControl.Resources>
<DataTemplate DataType="{x:Type viewModel:SomeViewModel}">
<control:SomeView Margin="5" />
</DataTemplate>
<DataTemplate DataType="{x:Type viewModel:AnotherViewModel}">
<control:AnotherView Margin="5" />
</DataTemplate>
</ItemsControl.Resources>
</ItemsControl>
</Grid>
And I have a user control as follows:
<UserControl.Resources>
<Style TargetType="{x:Type TextBlock}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={x:Static
RelativeSource.Self}, Path=DataContext.Selected}" Value="False">
<Setter Property="Foreground">
<Setter.Value>
Red
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding RelativeSource={x:Static
RelativeSource.Self}, Path=DataContext.Selected}" Value="True">
<Setter Property="Foreground">
<Setter.Value>
DarkSeaGreen
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Button Command="{Binding SelectCommand}" Content="+" HorizontalAlignment=
"Left" VerticalAlignment="Top" Width="25" Grid.Column="0"/>
<TextBlock HorizontalAlignment="Left" Margin="5" TextWrapping="Wrap" Text=
"{Binding Endorsement.Name}" VerticalAlignment="Top" Grid.Column="1" />
<Button Command="{Binding DeselectCommand}" Content="-" HorizontalAlignment=
"Right" VerticalAlignment="Top" Width="25" Grid.Column="2"/>
</Grid>

Answer 1

When the page loads and when the 'Selected' is set is two different times; hence selected is null when the page loads and nothing happens. Anticipate the null situation such as an added style
<DataTrigger Binding="{Binding RelativeSource={x:Static
RelativeSource.Self}, Path=DataContext.Selected}" Value="{x:Null}">
...

Answer 2

You shouldn't have to do this in your DataTrigger binding:
Binding="{Binding RelativeSource={x:Static
RelativeSource.Self}, Path=DataContext.Selected}"
A binding by default is referencing the DataContext so the equivalent simpler form is this:
Binding="{Binding Path=Selected}"
I don't think that will solve your problem though (but if it does that's great). One way around it is to define a default value in the style for your Foreground if neither trigger fires:
<UserControl.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Foreground" Value="Red" />
<Style.Triggers>
...
This assumes that all your items are deselected upon load. Hope this helps.
Cheers,
Eric