Public Event DragEnter As DragEventHandler

Dim instance As DropTargetBehavior
Dim handler As DragEventHandler
 
AddHandler instance.DragEnter, handler

public event DragEventHandler DragEnter

public event DragEnter: DragEventHandler; 

In JScript, you can handle the events defined by another class, but you cannot define your own.

public: __event DragEventHandler* DragEnter

public:
event DragEventHandler^ DragEnter

<StackPanel HorizontalAlignment="Left" VerticalAlignment="Top">
    <i:Interaction.Behaviors>
        <Intersoft:DragDropBehavior IsDragable="False" TooltipIcon="NotAllowed.png" TooltipText="Not Allowed"/>
    </i:Interaction.Behaviors>
    <Image Source="folder.png" Height="64" Width="64">
        <i:Interaction.Behaviors>
                <Intersoft:DragDropPointBehavior IsDragable="True"/>
        </i:Interaction.Behaviors>
    </Image>
    <TextBlock Text="My Archive" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</StackPanel>
<Image Source="RecycleBin.png" HorizontalAlignment="Center" Height="100" VerticalAlignment="Center" Width="100" AllowDrop=True>
</Image>

public MainPage()
{
    // Required to initialize variables
    InitializeComponent();

    ISEventManager.RegisterInstanceHandler(
        this.LayoutRoot, // any element in the routed path which applicable in your scenario
        DragDrop.DragEnterEvent, // the routed event
        new Intersoft.Client.UI.Controls.Interactivity.DragEventHandler(DropTarget_DragEnter), // the event handler
        true);
}

private void DropTarget_DragEnter(object sender, Intersoft.Client.UI.Controls.Interactivity.DragEventArgs e)
{
    e.SetCustomTooltip(new BitmapImage(new Uri("Remove.png", UriKind.RelativeOrAbsolute)));
    e.SetCustomTooltip("Remove to recycle bin.");
}