`TextBlock`'s `TextWrapping` property not getting set to `Wrap` on conditions - wpf

Question

The TextWrapping property was setting to Wrap in this code
<ListView Name="answerListView" ItemsSource="{Binding Path=answers}">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel>
<Expander Cursor="Hand">
<Expander.Header>
<TextBlock Text="{Binding Path=Body_Markdown}" TextWrapping="Wrap"/>
</Expander.Header>
</Expander>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
But, now I have added conditional formatting to the TextBlock, i.e., if answer is accepted then show it in green colour. So the code I have used is this:
<ListView Name="answerListView" ItemsSource="{Binding Path=answers}">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel>
<Expander Cursor="Hand">
<Expander.Header>
<TextBlock Text="{Binding Path=Body_Markdown}">
<TextBlock.Style>
<Style TargetType="{x:Type TextBlock}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=is_accepted}" Value="true">
<Setter Property="Foreground" Value="Green"/>
<Setter Property="TextWrapping" Value="Wrap"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
</Expander.Header>
</Expander>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Here, the second line of setting, i.e., Foreground property is not working. Even if I have the same line after <Style TargetType> or TextWrapping="Wrap" in TextBlock, then also it is not working.

Answer 1

ScrollViewer.HorizontalScrollBarVisibility="Disabled" must been added to ListView. Then this problem will be solved.

Answer 2

Specify the type too:
<Setter Property="TextBlock.Foreground" Value="Green"/>
<Setter Property="TextBlock.TextWrapping" Value="Wrap"/>

Answer 3

I guess you are binding a private field, instead of the public property:
{Binding Path=is_accepted} should be replaced by your property {Binding Path=Is_accepted}
This answer assumes that you are using the usual naming which makes fields start by lower case and Properties by Upper case.