问无法隐藏/删除活动的标题

EN

<style name="Theme.AppCompat.Light.Dialog_Configuration" parent="Theme.AppCompat.Light.Dialog">
  <item name="android:windowNoTitle">true</item>
  <item name="android:windowCloseOnTouchOutside">false</item>      
</style>

[Activity(
    Label = "Configuration",
    MainLauncher = false,        
    Theme = "@style/Theme.AppCompat.Light.Dialog_Configuration",        
    ExcludeFromRecents = true
)]

public class ConfigurationView : AppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        RequestWindowFeature(WindowFeatures.NoTitle);

        SetContentView(Resource.Layout.Configuration);
    }
}