I have the following XML syntax i created using RibbonX

    <customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui">
    <commands>
    <command idMso="Bold" enabled="false" />
    </commands>
   <ribbon>
     <tabs>
       <tab idMso="TabHome" visible="false" />
       <tab id="CustomTab" label="MyStock">
         <group id="UserInterface" label="User Interface">
           <button id="MyLogin" label="Login" 
             size="large" image="login" onAction="Login_User" />
           <button id="NewUser" label="Add New User" getEnabled="getEnabled" 
             size="large" image="add_user" onAction="New_User" />
         </group>
         <!--adding product button-->
         <group id="ProductInnterface" label="Product">
           <button id="AddProduct" label="Add/Update Product" 
             size="large" image="product" onAction="Add_Product" />
           <button id="ProductCat" label="Add Category" 
             size="large" image="product_cat" onAction="Add_Category" />
           <button id="ProductUnit" label="Add Unit" 
             size="large" image="product_unit" onAction="Add_Unit" />
         </group>
         <!--adding sales buttons-->
         <group id="ProductSales" label="Sales">
           <button id="CashSales" label="Cash" 
             size="large" image="cash_sales_33" onAction="Cash_Sales" />
           <button id="UpdateCashSales" label="Update" 
             size="normal" image="cash_sales_33" onAction="Update_Cash_Sales" />
           <button id="CreditSales" label="Credit" 
             size="large" image="credit_sales_32" onAction="Credit_Sales" />
           <button id="UpdateCreditSales" label="Update" 
             size="normal" image="credit_sales_32" onAction="Update_Credit_Sales" />
           <button id="SalesDashboard" label="Sales Dashboard" 
             size="large" image="sales_dashboard" onAction="Sales_Dashboard" />
         </group>
      </tab>
     </tabs >
   </ribbon>
 </customUI>

What i want to do is to add some VBA code that on WorkBook Open will disable all the ribbon buttons with the exception of the Login button.

A click on the Login Button should show Userform2 that has TextBox1 in which the user will enter his/her password. After entering the password, all the ribbon should be enabled.

Secondly on entering another password, only the sales buttons should be enabled.

Because i am new to this kind of xml syntax combined with vba, i have searched for so many solutions but could not get to find the correct on. I will be grateful if you guys can help me out. Please not: I am using excel vba. Thanks