public event InteractiveActionLeaveEventHandler InteractiveActionLeave

Public Event InteractiveActionLeave As InteractiveActionLeaveEventHandler

void reportViewer1_InteractiveActionLeave(object sender, Telerik.ReportViewer.Common.InteractiveActionEventArgs args)
{
    var strB = new System.Text.StringBuilder();
    strB.AppendLine("You have just left an action area.");
    strB.AppendLine("Action type: " + args.Action.GetType().Name);
    strB.AppendLine("ReportItem name: " + args.Action.ReportItemName);
    strB.AppendLine(string.Format("Item bounds: {0}", args.Bounds));

    Console.Out.WriteLine(strB.ToString());
}

' Handles the InteractiveActionLeave event
' Do not forget to add the WithEvents clause on ReportViewer1 instantiation if needed.
Private Sub reportViewer1_InteractiveActionLeave(sender As Object, args As Telerik.ReportViewer.Common.InteractiveActionEventArgs) Handles ReportViewer1.InteractiveActionLeave

    Dim strB = New System.Text.StringBuilder()
    strB.AppendLine("You have just left an action area.")
    strB.AppendLine("Action type: " + args.Action.[GetType]().Name)
    strB.AppendLine("ReportItem name: " + args.Action.ReportItemName)
    strB.AppendLine(String.Format("Item bounds: {0}", args.Bounds))

    Console.Out.WriteLine(strB.ToString())
End Sub