BoardColumn.xaml

<UserControl x:Class="Kanaban.BoardColumn"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:Kanaban"
             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
             mc:Ignorable="d" Loaded="AListBox_OnLoaded" x:Name="control"
             d:DesignHeight="450" d:DesignWidth="350">
   
    <GroupBox Style="{StaticResource MaterialDesignCardGroupBox}"
              Header="{Binding ElementName=control , Path=ListType , FallbackValue=Header}" Margin="4">
        <materialDesign:DialogHost x:Name="host">
            <Grid>
                <ListBox Name="lst" Drop="UIElement_OnDrop" AllowDrop="True"
                         PreviewMouseLeftButtonDown="UIElement_OnPreviewMouseLeftButtonDown">
                    <ListBox.ItemContainerStyle>
                        <Style TargetType="ListBoxItem">
                            <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                        </Style>
                    </ListBox.ItemContainerStyle>
                    <ListBox.ItemTemplate>
                        <DataTemplate DataType="local:WorkItem">
                            <DataTemplate.Resources>
                                <local:PriorityToColorConverter x:Key="con" />
                            </DataTemplate.Resources>
                            <Border Background="{Binding Priority , Converter={StaticResource con}}" Padding="4"
                                    CornerRadius="5">
                                <StackPanel>
                                    <TextBlock FontSize="20" Text="{Binding Title}" />
                                    <TextBlock FontSize="15" Text="{Binding Description}" TextWrapping="Wrap" />
                                    <TextBlock FontSize="15" Text="{Binding Priority}" HorizontalAlignment="Right"
                                               Margin="3" FontWeight="Bold" />
                                </StackPanel>

                            </Border>
                        </DataTemplate>
                    </ListBox.ItemTemplate>

                    <ListBox.Items>
                        <local:WorkItem />
                    </ListBox.Items>

                    <ListBox.ContextMenu>
                        <ContextMenu>
                            <MenuItem Header="Delete" Click="MenuItem_OnClick" />
                        </ContextMenu>
                    </ListBox.ContextMenu>
                </ListBox>
                <Button HorizontalAlignment="Right" Style="{StaticResource MaterialDesignFloatingActionButton}"
                        Content="+" FontSize="35" VerticalContentAlignment="Top" VerticalAlignment="Bottom"
                        Margin="0,0,20,20" Click="btn_add_click" />
            </Grid>
        </materialDesign:DialogHost>

    </GroupBox>

</UserControl>