Public Event DragLeave As DragEventHandler

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

public event DragEventHandler DragLeave

public event DragLeave: DragEventHandler; 

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

public: __event DragEventHandler* DragLeave

public:
event DragEventHandler^ DragLeave

<Intersoft:UXStackPanel HorizontalAlignment="Center" VerticalAlignment="Top" DragMode="Move" AllowMoveItem="True" AllowDropItem="True">
    <StackPanel>
        <Image Source="folder.png" Height="64" Width="64"/>
        <TextBlock Text="My Archive" HorizontalAlignment="Center" VerticalAlignment="Center"/>
    </StackPanel>
    <StackPanel>
        <Image Source="folder.png" Height="64" Width="64"/>
        <TextBlock Text="My Photos" HorizontalAlignment="Center" VerticalAlignment="Center"/>
    </StackPanel>
    <StackPanel>
        <Image Source="folder.png" Height="64" Width="64"/>
        <TextBlock Text="My Videos" HorizontalAlignment="Center" VerticalAlignment="Center"/>
    </StackPanel>

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

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

private void DropTarget_DragLeave(object sender, Intersoft.Client.UI.Controls.Interactivity.DragEventArgs e)
{
    e.SetCustomTooltip("Can not drop to this area.");            
}