scrollButtonIndex Property

Gets index of scroll button involved in mouse event. Possible values: 0 - right or top scroll button, 1 - left or bottom scroll button, -1 - it is event over tab item or add-new-tab button.Index of scroll button.

Syntax

ASP.NET Ajax Javascript (Specification)
function get_scrollButtonIndex() : Integer

ASP.NET Ajax Javascript (Usage)
var resultVar = instanceOfTabMouseEventArgs.get_scrollButtonIndex();