How to open a create record form in new tab using JS

    // Info of child entity

    var entityFormOptions = {};

    entityFormOptions["entityName"] = "cr1a2_class";

    entityFormOptions["useQuickCreateForm"] = true;

    entityFormOptions["openInNewWindow"] = true;

    // Info of parent entity

    var formParameters = {};

    formParameters["new_classesid"] = Xrm.Page.data.entity.getId();

    formParameters["new_classesidname"] = Xrm.Page.getAttribute("name").getValue();

    formParameters["new_classesidtype"] = "account";

    // Open form in new window

    Xrm.Navigation.openForm(entityFormOptions, formParameters).then(

        function (lookup) {

            console.log("Success"); a

        },

        function (error) { console.log("Error"); }

    );