How to execute w2ui delete event without warning message?

w2ui.grid.on('delete', function(event) {
    event.force = true;
    //console.log('No confirmation required');
});

OR

onDelete: function (event) {
        event.force = true;
...

}

How to update text and tooltip of default save button in w2ui grid?

var btn = w2obj.grid.prototype.buttons;
btn['save'].text = w2utils.lang('New Text');

btn['delete'].text = w2utils.lang('Reject Selected');
btn['delete'].tooltip = null;