title: Missing "Add new data source" and "Show data sources" option in web application
body: <p>I have a Windows application project.  I could go to the menu <code>Data &gt; Add new data source</code> and successfully added a new data source of customers table from northwind database. </p>
  
  <p>I could also drag and drop customers table from data sources window to a Windows form. </p>
  
  <p>I want to perform SAME action with a web form. </p>
  
  <p>I created an empty website (tried also with web project) and tried to perform similar activity. </p>
  
  <p>There is not <code>Add new data source</code> or <code>Show data sources</code> options here.</p>
  
  <p>How can the same be done in a web forms application?</p>