Datagrid not showing ObservableCollection

Hallo,

I am making a quiz game with entityframework and MVVM light. Currently i am working on a part where you can create questions and answers to put into a quiz.

What i'm trying to do is when i click on one of the questions i want to see the answers that are linked to it in the datagrid below. When i click the question an ObservableCollection gets filled with the answers, but it is not showing up in anyway in the datagrid even though the collection gets filled properly.

XAML:

<Window x:Class="Kwisspel.View.QuestionManagement"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
        xmlns:mvvm="http://www.galasoft.ch/mvvmlight"
        xmlns:local="clr-namespace:Kwisspel.View"
        mc:Ignorable="d"
        DataContext="{Binding QuestionManagement, Source={StaticResource Locator}}"
        Title="QuestionManagement" Height="450" Width="800"><StackPanel><StackPanel Orientation="Horizontal" Margin="10,10,0,10"><TextBlock Margin="0,0,10,0">Nieuw vraag:</TextBlock><TextBox x:Name="QuestionText" Width="500" Margin="0,0,10,0"></TextBox><Button Command="{Binding AddQuestions}" CommandParameter="{Binding Text, ElementName=QuestionText}">Toevoegen</Button></StackPanel><DataGrid x:Name="QuestionsGrid" Margin="0,0,0,5" ItemsSource="{Binding Questions, Mode=TwoWay}" Height="150" ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto"><DataGrid.Columns></DataGrid.Columns><i:Interaction.Triggers><i:EventTrigger EventName="SelectionChanged"><mvvm:EventToCommand 
                        Command="{Binding SelectedQuestion, Mode=TwoWay}"
                        CommandParameter="{Binding ElementName=QuestionsGrid,Path=SelectedItem}" /></i:EventTrigger></i:Interaction.Triggers></DataGrid><StackPanel Margin="10,5,0,10" Orientation="Horizontal"><TextBlock Margin="0,0,10,0">Nieuw antwoord:</TextBlock><TextBox x:Name="AnswerText" Width="500" Margin="0,0,10,0"></TextBox><Button Command="{Binding AddAnswers}" CommandParameter="{Binding Text, ElementName=AnswerText}" x:Name="AnswerButton">Toevoegen</Button></StackPanel><DataGrid x:Name="AnswerDatagrid" ItemsSource="{Binding Answers, Mode=TwoWay}" Height="150" ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto"></DataGrid></StackPanel></Window>

ViewModel:

 public ICommand SelectedQuestion { get; set; }
        public ObservableCollection<QuestionViewModel> Questions { get; set; }
        public ObservableCollection<AnswerViewModel> Answers { get; set; }
        public List<AnswerViewModel> ModifiedItems { get; set; }

        public QuestionManagementViewModel()
        {
            SelectedQuestion = new RelayCommand<QuestionViewModel>(getInfo);

            Answers = new ObservableCollection<AnswerViewModel>();

            using (var context = new KwisspelEntities())
            {
                var questions = context.Question
                    .ToList()
                    .Select(q => new QuestionViewModel(q));
                Questions = new ObservableCollection<QuestionViewModel>(questions);
            }
        }

        public void getInfo(QuestionViewModel question)
        {
            if (question != null)
            {
                if (Answers != null)
                {
                    Answers.Clear();
                }
               
                using (var context = new KwisspelEntities())
                {
                    var answers = context.Answer
                    .Where(a => a.Question_Id == question.id)
                    .ToList()
                    .Select(a => new AnswerViewModel(a));
                    Answers = new ObservableCollection<AnswerViewModel>(answers);
                }
            }
        }

Thank you in advance