Well...kind of working, I needed to press twice the down key, so I rewrote
the keyPressed as


public class MyRowEditor extends TableViewRowEditor {

        @Override
        public boolean keyPressed(int keyCode, Keyboard.KeyLocation kl) {
                boolean consumed = false;
                System.out.println("key pressed");
                //if (keyCode == Keyboard.KeyCode.KEYPAD_DOWN || keyCode ==
Keyboard.KeyCode.KEYPAD_UP) {
                if (keyCode == Keyboard.KeyCode.DOWN) {
                        System.out.println("Down pressed");
                        close(true);
                        consumed = true;
                        int index = getTableView().getSelectedIndex();
                        getTableView().setSelectedIndex(index+1);
                } else if (keyCode == Keyboard.KeyCode.UP) {
                        System.out.println("UP pressed");
                        close(true);
                        consumed = true;
                        int index = getTableView().getSelectedIndex();
                        getTableView().setSelectedIndex(index-1);
                }
                return consumed;
        }
}

I have also overridden the selectedRowChanged() method to check for
isEditing and endEdit(), however, I still get the initial error: 

Duplicate listener org.apache.pivot.wtk.content.tableviewrowedito...@10ade7e
added to org.apache.pivot.wtk.container$containermouselistenerl...@956254
java.lang.IllegalArgumentException: Component already has a parent.
        at org.apache.pivot.wtk.TablePane$Row.insert(TablePane.java:199)
        at org.apache.pivot.wtk.TablePane$Row.add(TablePane.java:187)
        at
org.apache.pivot.wtk.content.TableViewRowEditor.open(TableViewRowEditor.java:301)
        at org.apache.pivot.wtk.Window.open(Window.java:585)
        at
org.apache.pivot.wtk.content.TableViewRowEditor.beginEdit(TableViewRowEditor.java:182)


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