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