public new void Start()
{
base.Start();
var root = visualTree;
var popupWindow = new PopupWindow();
popupWindow.text = "New Task";
root.Add(popupWindow);
m_TextField = new TextField {
name = "input", viewDataKey = "input", isDelayed = true
};
popupWindow.Add(m_TextField);
m_TextField.RegisterCallback <KeyDownEvent>(AddTask);
var button = new Button(AddTask)
{
text = "Save task"
};
popupWindow.Add(button);
var box = new Box();
m_TasksContainer = new ScrollView();
m_TasksContainer.showHorizontal = false;
box.Add(m_TasksContainer);
root.Add(box);
}