Hi Gopakumar N G,

self.gui.show_screen('products');
$(".my-products-div").show(); // added new class to products div and tried show() method
$(".product-screen ").removeClass("oe_hidden");

It is not possible,I have suggestions for your requirement:
Search "this.gui.show_popup " in addons/point_of_sale it will be like this :

self.gui.show_popup("error-traceback", {
title: _t("Unknown Products"),
body:
_t(
"Unable to load some order lines because the " +
"products are not available in the POS cache.\n\n" +
"Please check that lines :\n\n * "
) + self.unknown_products.join("; \n *"),
});

Use this function and edit it according to your requirement, although you can create a similar widget.

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari