WPF Data Binding won't work

Question

Hey, I have got an UserControll with a DependencyProperty called "Risikobewertung" whitch has the own Datatype "RisikoBewertung"(Datatype created by LINQ). So in my Controll I try to bind the Fields of RisikoBewertung to the TextBoxes on the Controll, but It won't work. I hope you can help me, and tell me why ;)

Code: UserControl.xaml:

<UserControl x:Class="Cis.Modules.RiskManagement.Views.Controls.RisikoBewertungEditor"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:gridtools="clr-namespace:TmgUnity.Common.Presentation.Controls.DataGridTools;assembly=TmgUnity.Common.Presentation"
xmlns:converter="clr-namespace:Cis.Modules.RiskManagement.Views.Converter"
xmlns:tmg="clr-namespace:TmgUnity.Common.Presentation.Controls.FilterDataGrid;assembly=TmgUnity.Common.Presentation"
xmlns:validators="clr-namespace:TmgUnity.Common.Presentation.ValidationRules;assembly=TmgUnity.Common.Presentation"
xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"
xmlns:risikoControls="clr-namespace:Cis.Modules.RiskManagement.Views.Controls">
<UserControl.Resources>
    <converter:CountToArrowConverter x:Key="CountConverter" />
</UserControl.Resources>

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Name="Veränderung"/>
        <ColumnDefinition Name="Volumen" />
        <ColumnDefinition Name="Schadenshöhe" />
        <ColumnDefinition Name="SchadensOrte" />
        <ColumnDefinition Name="Wahrscheinlichkeit" />
        <ColumnDefinition Name="Kategorie" />
        <ColumnDefinition Name="Handlungsbedarf" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="20" />
        <RowDefinition />
    </Grid.RowDefinitions>
    <Image Source="{Binding Path=Entwicklung, Converter={StaticResource CountConverter}, UpdateSourceTrigger=PropertyChanged}" Grid.RowSpan="2" Grid.Row="0"  Width="68" Height="68"  Grid.Column="0" />
    <TextBox Grid.Column="1" Grid.Row="0" Text="Volumen" />
    <TextBox Grid.Column="1" Grid.Row="1">
        <TextBox.Text>
            <Binding Path="Volumen" UpdateSourceTrigger="PropertyChanged" />
        </TextBox.Text>
    </TextBox>
    <TextBox Grid.Column="2" Grid.Row="0" Text="Schadenshöhe" />
    <TextBox Grid.Column="2" Grid.Row="1" Text="{Binding Path=Schadenshöhe, UpdateSourceTrigger=PropertyChanged}" />
    <StackPanel Grid.Column="3" Grid.RowSpan="2" Grid.Row="0" Orientation="Horizontal">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="20" />
                <RowDefinition />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <TextBox Text ="Politik" Grid.Row="0" Grid.Column="0"/>
            <CheckBox Name="Politik" Grid.Row="1" Grid.Column="0" IsChecked="{Binding Path=Politik, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" HorizontalAlignment="Center" />
            <TextBox Text ="Vermögen" Grid.Row="0" Grid.Column="1" />
            <CheckBox Name="Vermögen" Grid.Row="1" Grid.Column="1" IsChecked="{Binding Path=Vermögen, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" HorizontalAlignment="Center" />
            <TextBox Text ="Vertrauen" Grid.Row="0" Grid.Column="2" />
            <CheckBox Name="Vertrauen" Grid.Row="1" Grid.Column="2" IsChecked="{Binding Path=Vertrauen, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" HorizontalAlignment="Center" />
        </Grid>
    </StackPanel>
    <TextBox Grid.Column="4" Grid.Row="0" Text="Wahrscheinlichkeit" />
    <TextBox Grid.Column="4" Grid.Row="1"  Text="{Binding Path=Wahrscheinlichkeit, UpdateSourceTrigger=PropertyChanged}"/>
    <risikoControls:RiskTrafficLightControl Grid.Column="5" Grid.Row="0" Grid.RowSpan="2" RiskValue="{Binding Path=Kategorie, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
    <StackPanel Grid.Column="6" Grid.RowSpan="2" Grid.Row="0" Orientation="Vertical">
        <TextBox Text="Handlungsbedarf" />
        <CheckBox  VerticalAlignment="Center" HorizontalAlignment="Center"  IsChecked="{Binding Path=Handlungsbedarf, UpdateSourceTrigger=PropertyChanged}" />

    </StackPanel>
</Grid>

The CodeBehind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using Cis.Modules.RiskManagement.Data;
using Cis.Modules.RiskManagement.Views.Models;


namespace Cis.Modules.RiskManagement.Views.Controls
{
    /// <summary>
    /// Interaktionslogik für RisikoBewertungEditor.xaml
    /// </summary>
    public partial class RisikoBewertungEditor : UserControl, INotifyPropertyChanged
    {


        public event PropertyChangedEventHandler PropertyChanged;
        public static readonly DependencyProperty RisikoBewertungProperty = DependencyProperty.Register("RisikoBewertung", typeof(RisikoBewertung), typeof(RisikoBewertungEditor), new PropertyMetadata(null, new PropertyChangedCallback(RisikoBewertungChanged)));
        // public static readonly DependencyProperty Readonly = DependencyProperty.Register("EditorReadonly", typeof(Boolean), typeof(RisikoBewertungEditor), new PropertyMetadata(null, new PropertyChangedCallback(ReadonlyChanged)));

         private static void RisikoBewertungChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs arguments)
         {
             var bewertungEditor = dependencyObject as RisikoBewertungEditor;
             bewertungEditor.RisikoBewertung = arguments.NewValue as RisikoBewertung;
         }
         /*
          private static void ReadonlyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs arguments)
          {
          }
         */
         public RisikoBewertung RisikoBewertung
         {
             get
             {
                 return GetValue(RisikoBewertungProperty) as RisikoBewertung;
             }
             set
             {
                 SetValue(RisikoBewertungProperty, value);

                 if (PropertyChanged != null)
                 {
                     PropertyChanged(this, new PropertyChangedEventArgs("RisikoBewertung"));
                 }
             }
         }
         /*
          public Boolean EditorReadonly
          {
              get;
              set;
          }
          */

         public void mebosho(object sender, RoutedEventArgs e)
         {
             MessageBox.Show(RisikoBewertung.LfdNr.ToString());
         }

        public RisikoBewertungEditor()
        {
            InitializeComponent();
            RisikoBewertung = new RisikoBewertung();
            this.DataContext = (GetValue(RisikoBewertungProperty) as RisikoBewertung);
        }

    }
}

and a little example of it's usage:

        <tmg:FilterDataGrid Grid.Row="0" AutoGenerateColumns="False"  
                      ItemsSource="{Binding TodoListe}"
                      IsReadOnly="False"  x:Name="TodoListeDataGrid"
                      CanUserAddRows="False" SelectionUnit="FullRow"
                      SelectedValuePath="."   
                      SelectedValue="{Binding CurrentTodoItem}"
                      gridtools:DataGridStyle.SelectAllButtonTemplate="{DynamicResource CisSelectAllButtonTemplate}"
                      CanUserResizeColumns="True" MinHeight="80"
                      SelectionChanged="SelectionChanged"
                      HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                      diagnostics:PresentationTraceSources.TraceLevel="High"  
                        >
        <tmg:FilterDataGrid.RowDetailsTemplate>
            <DataTemplate>
                <risikoControls:RisikoBewertungEditor x:Name="BewertungEditor" RisikoBewertung="{Binding ElementName=TodoListeDataGrid, Path=SelectedValue}" diagnostics:PresentationTraceSources.TraceLevel="High">
                </risikoControls:RisikoBewertungEditor>
            </DataTemplate>
        </tmg:FilterDataGrid.RowDetailsTemplate>

        <tmg:FilterDataGrid.Columns>
            <toolkit:DataGridTextColumn Binding="{Binding Path=LfdNr}" Header="LfdNr" />
        </tmg:FilterDataGrid.Columns>

    </tmg:FilterDataGrid>

Answer 1

I don't see that you set your Grid's ItemsSource to anything.

Answer 2

The problem is that inside the constructor of your user control, you are creating a new object and setting it as the DataContext, later when you set the RisikoBewertung property to something else in XAML, the DataContext remains set on the other empty object. What you need to do is bind the user control's DataContext to the RisikoBewertung property. Like this:

<UserControl ...
   DataContext="
        {Binding RelativeSource={RelativeSource Self}, 
                 Path=RisikoBewertung}"
.../>

And remove everything from its constructor except InitializeComponent();

public RisikoBewertungEditor()
{
    InitializeComponent();
}