Buttons not showing in the Copy / Paste action bar associated with the TextView in the dialog

Unfortunately, I can only check on my Samsung N7000 Note phone running Android 4.1.2, as this is my only device. My application creates a dialog built like this:

AlertDialog.Builder alert = new AlertDialog.Builder(this);

// Set an TextView view to get user input
final TextView input = new TextView(this);
input.setTextIsSelectable(true);
input.setText(sb.toString());
alert.setView(input);
alert.setTitle("Title");
alert.setPositiveButton(getString(R.string.ok),
    new DialogInterface.OnClickListener()
    {
      public void onClick(DialogInterface dialog, int whichButton)
      {
        // do something here
      }
    });

alert.show();

      

        
        
        
      

    

This will bring up the dialogue as expected. However, as shown here, when I try to select the text shown in the TextView, the copy / paste action pane is displayed, but there are no buttons to copy, select all, etc. that appear in the action pane. I note that I can touch the top right, see the button briefly, and then see the message copied to the clipboard. Then I can go to another location and insert the data. So the functionality is there, it just isn't displayed to the user.

Can anyone shed some light on what I am doing wrong here?

thank