I get it but showing an error like this How to solve it?  

  How create a PDF viewer component and java class ?  

      when click the drag component to place the anchor-link-container .while opening the anchor-link-container to add a set of components  but issues were  added the policy doesn't show, drag component policy was reflected  the anchor-link-container

there are 3 heading to show 3 buttons but when clicking the one heading shows only one button.  

try in a different manner, but the expected result does not come.