Why is the binding not working?

Question

C++ / C#

In one of the controls there is a binding, but it does not work. Complains about the datacontext. I add - there are other errors. What could be wrong?

<Window x:Class="WpfGraphTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:graphsharp="clr-namespace:GraphSharp.Controls;assembly=GraphSharp.Controls"
        xmlns:local="clr-namespace:WpfGraphTest"
        xmlns:zoom="clr-namespace:WPFExtensions.Controls;assembly=WPFExtensions" 
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        Title="GraphSharpDemo" Height="350" Width="525">

    <Window.Resources>
        <DataTemplate x:Key="demoTemplate" DataType="{x:Type local:PocVertex}">
            <StackPanel Orientation="Horizontal" Margin="5">
                <Image x:Name="img" Source="C:/users/Admin/source/repos/WpfGraphTest/boy.ico" Width="20" Height="20" />
                <TextBlock Text="{Binding Path=ID, Mode=OneWay}" Foreground="White" />
            </StackPanel>
            <DataTemplate.Triggers>
                <DataTrigger Binding="{Binding IsMale}" Value="false">
                    <Setter TargetName="img" Property="Source"
                        Value="C:/users/Admin/source/repos/WpfGraphTest/girl.ico"/>
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>

        <Style TargetType="{x:Type graphsharp:VertexControl}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type graphsharp:VertexControl}">
                        <Border BorderBrush="White" 
                        Background="Black"
            BorderThickness="2"
            CornerRadius="10,10,10,10"
            Padding="{TemplateBinding Padding}">
                            <ContentPresenter Content="{TemplateBinding Vertex}" 
                            ContentTemplate="{StaticResource demoTemplate}"/>

                            <Border.Effect>
                                <DropShadowEffect BlurRadius="2" Color="LightGray" 
                            Opacity="0.3" Direction="315"/>
                            </Border.Effect>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style TargetType="{x:Type graphsharp:EdgeControl}">
            <Style.Resources>
                <ToolTip x:Key="ToolTipContent">
                    <StackPanel>
                        <TextBlock FontWeight="Bold" Text="Edge.ID"/>
                        <TextBlock Text="{Binding ID}"/>
                    </StackPanel>
                </ToolTip>
            </Style.Resources>
            <Setter Property="ToolTip" Value="{StaticResource ToolTipContent}"/>
        </Style>
    </Window.Resources>

   <zoom:ZoomControl  Grid.Row="1"  Zoom="0.2" 
        ZoomBoxOpacity="0.5" Background="#ff656565">
        <local:PocGraphLayout x:Name="graphLayout" Margin="9,8,11,12"
        Graph="{Binding Path=Graph}"
        LayoutAlgorithmType="{Binding Path=LayoutAlgorithmType, Mode=OneWay}"
        OverlapRemovalAlgorithmType="FSA"
        HighlightAlgorithmType="Simple" />
    </zoom:ZoomControl>
</Window>

Answer 1

<Application.Resources>
        <local:MainViewModel x:Key="MainViewModel" />
    </Application.Resources>