declare class MVCxClientGridView extends ASPxClientGridView

@Html.DevExpress().GridView(settings => {
    settings.Name = "GridView";
    ...
}).Bind(NorthwindDataProvider.GetOrders()).GetHtml()

@Html.DevExpress().Button(settings => {
    settings.Name = "btnSave";
    settings.Text = "Save";
    settings.ClientSideEvents.Click = "OnSave";
}).GetHtml()

@Html.DevExpress().Button(settings => {
    settings.Name = "btnLoad";
    settings.Text = "Load";
    settings.ClientSideEvents.Click = "OnLoad";
}).GetHtml()

<script type="text/javascript">
    function OnSave(s, e) {
        GridView.PerformCallback({ customAction: 'Save' });
    }
    function OnLoad(s, e) {
        GridView.PerformCallback({ customAction: 'Load' });
    }
</script>