Any chance you can provide some more code on this? I am running into the same issue with a sample project. I tried your approach but I am still not hitting the command handler. What am I doing wrong here?

<Window x:Class="InfragisticsDragDrop.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:ig="http://schemas.infragistics.com/xaml"
        xmlns:infragisticsDragDrop="clr-namespace:InfragisticsDragDrop"
        Title="MainWindow"
        Width="525"
        Height="350">
    <Window.Resources>
        <ResourceDictionary>
 
            <DataTemplate x:Key="ListBoxItemTemplate" DataType="{x:Type infragisticsDragDrop:Person}">
                <StackPanel Background="Transparent">
                    <ig:DragDropManager.DragSource>
                        <ig:DragSource IsDraggable="True">
                            <i:Interaction.Triggers>
                                <i:EventTrigger EventName="DragStart">
                                    <i:InvokeCommandAction Command="{Binding Source={x:Reference Lb1}, Path=DragStartedCommand}" />
                                </i:EventTrigger>
                            </i:Interaction.Triggers>
                        </ig:DragSource>
                    </ig:DragDropManager.DragSource>
 
                    <TextBlock Margin="2" Text="{Binding Name}" />
                    <TextBlock Margin="2" Text="{Binding Age}" />
 
                </StackPanel>
 
            </DataTemplate>
 
        </ResourceDictionary>
    </Window.Resources>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
 
        <ListBox Name="Lb1"
                 Grid.Column="0"
                 ItemTemplate="{StaticResource ListBoxItemTemplate}"
                 ItemsSource="{Binding People}" />
 
        <ListBox Name="Lb2"
                 Grid.Column="1"
                 Background="DarkGray"
                 ItemsSource="{Binding DroppedPeople}">
            <ig:DragDropManager.DropTarget>
                <ig:DropTarget IsDropTarget="True">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="Drop">
                            <i:InvokeCommandAction Command="{Binding DropCommand}" />
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </ig:DropTarget>
            </ig:DragDropManager.DropTarget>
        </ListBox>
 
 
 
    </Grid>
</Window>