Lightswitch html client override default save button -

i want able override default save button on html client cant seem find control so. want write validation behind , allow user select option cant seem find it.

i know silverlight client can override cant seem override in html client.

thanks

it's achieved using beforeapplychanges.

example: (please excuse typos/syntax errors, rough idea!)

myapp.addeditscreen.beforeapplychanges = function (screen) {     switch (screen.property_savingstatus) {     case 'not saving':         settimeout(function () {             // override save -> toggle savingstatus -> call save again             savemychangesmyway();             screen.property_savingstatus = 'commit';             myapp.commitchanges(); // or discard or apply.         }, 500);         return false; // cancel save changes request         break;     case 'apply':         return true;         break;     default: };