code: public void show(android.support.v4.app.FragmentManager manager, String tag){
          mActiveSupportMail = generateSupportDialogFragment();
          mActiveSupportMail.show(manager, tag);
      }
docs: Show/Create a Support DialogFragment on the provided Support FragmentManager with
  the given tag
  
  @see android.support.v4.app.DialogFragment#show(android.support.v4.app.FragmentManager, String)
  @param manager       the support fragment manager to display the dialog with
  @param tag           the tag to identify the dialog fragment in the manager