title: allow only custom colors in color dialog
body: <p>i want to show a color dialog that only displays custom colors and no basic colors or any other color. How can I do this? Is it even possible?</p>
  
  <p><img src="https://i.stack.imgur.com/ZWl5P.jpg" alt="Color Dialog"></p>
  
  <p>how can I hide the basic colors section in this dialog box and only show the custom colors section?</p>