// Register the event for custom actions hovering a object with link property for the preview.
LL.HandleHyperlinkAction += LL_HandleHyperlinkAction;

// Event implementation for handling custom actions within the preview
private void LL_HandleHyperlinkAction(object sender, HyperLinkClickedEventArgs e)
{
    // Collect input data for further use
    string function = string.Empty, value = string.Empty;
    if (!string.IsNullOrEmpty(e.Data))
    {
        function = e.Data.Split('=')[0];
        value = e.Data.Split('=')[1];
    }
    switch (e.Action)
    {
        // Define the tooltip when hovering over an object
        // within the preview
        case LlHyperlinkAction.QueryTooltip:
        {
            // check if this is "my" business at all
            if (e.Protocol == "myProtocol")
            {
                switch (function)
                {
                    case "searchCustomer":
                    {
                        e.TooltipText = $"Searches the selected \n customer" +
                            $" '{value}' within the application.";
                    }
                    break;
                    case "searchOrder":
                    {
                        e.TooltipText = $"Searches the selected \n order" +
                            $" with ID '{value}' within the application.";
                    }
                    break;
                }
                // 1 = indicates handled by your own application-code
                // 0 = use default handling from List & Label
                e.ReturnValue = 1;
            }
        }
        break;
        // This is queried whenever the object with the link property is hovered
        case LlHyperlinkAction.RightButtonAllowed:
        {
            // 1 = not allowed
            // 2 = allowed
            e.ReturnValue = 1;
        }
        break;
        // Left mouse button was clicked
        case LlHyperlinkAction.LeftClicked:
        {
            // 1 = indicates handled by your own application-code
            // 0 = use default handling from List & Label
            int actionResult = 0;
            if (e.Protocol == "myProtocol")
            {
                MessageBox.Show($"Object with custom Link property " +
                    $"was clicked with left mouse button and contains " +
                    $"this information:\n\n " +
                $"protocol: {e.Protocol}\n " +
                $"function: {function}\n " +
                $"value: {value}");
                actionResult = 1;
            }
            e.ReturnValue = actionResult;
        }
        break;
        // Right mouse button was clicked
        case LlHyperlinkAction.RightClicked:
        {
            // do anything with the right-click here, if allowed
            // by action LlHyperlinkAction.RightButtonAllowed
        }
        break;
    }
}