экзекуторы без фамилии

ROGOZ/Pages/TaskList.xaml

@@ -20,7 +20,7 @@
             </ComboBox>
 
             <Separator Background="Transparent" BorderThickness="0" Width="7"/>
-            <ComboBox Margin="5" Padding="6 5" Width="200" Height="40" Name="CmbExecutorSort" FontSize="20" DisplayMemberPath="{Binding Executor.User.MiddleName}" SelectedValuePath="ID" Text="{Binding ExecutorID}" Style="{DynamicResource ComboBoxStyle1}" ItemContainerStyle="{DynamicResource AddTaskCmbItem}" />
+            <ComboBox Margin="5" Padding="6 5" Width="200" Height="40" Name="CmbExecutorSort" FontSize="20" DisplayMemberPath="" SelectedValuePath="ID" Text="{Binding ExecutorID}" Style="{DynamicResource ComboBoxStyle1}" ItemContainerStyle="{DynamicResource AddTaskCmbItem}" />
 
             <Separator Background="Transparent" BorderThickness="0" Width="7"/>
             <TextBox Name="TBoxSearch" Width="200" Height="40" Margin="5" FontSize="20" HorizontalAlignment="Right" Style="{DynamicResource AddTaskTB}" TextChanged="TBoxSearch_TextChanged" />