Me.WebTab1.ClientEvents.MouseOut = "WebTab1_MouseOut"
this.WebTab1.ClientEvents.MouseOut = "WebTab1_MouseOut";
// The client event MouseOut takes two parameters sender and e // sender is the object which is raising the event // e is the TabMouseEventArgs function WebTab1_MouseOut(sender, e) { var tab =sender; //Gets the index of the tab involved in the MouseOut event var tabIndex = e.get_tabIndex(); //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 var scrollButtonIndex = e.get_scrollButtonIndex(); //Assuming you have a label called labelOutput on the form var label = $get('labelOutput'); if (e.isAddNewTabButton()) { label.innerHTML = "Mouse out of add new tab button"; } else if (e.isCloseButton()) { label.innerHTML = "Mouse out of close button with tab index" + tabIndex; } else if (tabIndex != -1) { label.innerHTML = "Mouse out of the tab with index '" + tabIndex + "'"; } else { if (scrollButtonIndex == 0) { label.innerHTML = "Mouse out of the right scroll button"; } else label.innerHTML = "Mouse out of the left scroll button"; } }