Update Panel With Multi Select List Box

1) Update Panel Should Have The Following Attributes:
ValidateRequestMode="Disabled" UpdateMode="Conditional"

2)Buttons Should have onClick Event
3)Register a PostBackTrigger in triggers tag for each button you want to post back.
4)the buttons should be outside formview, gridview, repeater, etc so that the triggers see it. (it access the button with its ID you cant find control inside it).

THE MOST IMPORTANT PART

if you have multiselect that binds (read the value from) another Multiselect
you must add the following code to your script in order to bind and read the new data:
$(function () {
pageLoad();
});
//On UpdatePanel Refresh
var prm = Sys.WebForms.PageRequestManager.getInstance();
if (prm != null) {
prm.add_endRequest(function (sender, e) {
if (sender._postBackSettings.panelsToUpdate != null) {
pageLoad();
}
});
};
function pageLoad(sender, args) {
//the IDs Of the multiselect controls you want to refresh
$("[id$=lbRoles]").selectpicker();                                       
$("[id$=lbUsers]").selectpicker(); 
};

Control ==> In UI/CommonUc/Student/StudentUserComment