This event can be canceled and in this case a new tab will not be selected. While processing this event,- the postBack can be canceled or triggered.
It can be the name of an implemented function or an explicit javascript statement(s). If the name of the function is used, then that event handler may contain 3 parameters.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2