Notify Parent Class from Context menu

I have a following code, how can I notify the Parent class, the EDIT function was selected in MyDataGrid class.
Basically I am creating a context menu and I want to notify the Parent class which context menu Item was selected and on which Table row, how can I create and event to notify the Parent class?

Thank You

Peter.

public class Parent extends Window implements ClickListener {

public Parent() {

MyDataGrid mdg = new MyDataGrid();
addComponent(mdg);

}
}

public class MyDataGrid extends VerticalLayout {

private final Table _table = new Table();
static final Action ACTION_ADD = new Action("Add New");
static final Action ACTION_EDIT = new Action("Edit");
static final Action ACTION_DELETE = new Action("Delete");
static final Action ACTION_CANCEL = new Action("Cancel Menu");
static final Action[] ACTIONS = new Action[]{ACTION_ADD, ACTION_EDIT, ACTION_DELETE, ACTION_CANCEL};

public MyDataGrid() {
addComponent(_table);

_table.addActionHandler(new Action.Handler() {

@Override
public Action[] getActions(Object target, Object sender) {

return ACTIONS;
}

@Override
public void handleAction(Action action, Object sender, Object target) {

if (ACTION_EDIT.equals(action)) {
//
// I want to notify the parent about this event
//
}

_table.requestRepaint();
}
});
}
}