private void Start()
{
_expandables = GetComponentsInChildren <IExpandableUIElement>(true);
for (int i = 0; i < _expandables.Length; i++)
{
ExpandableSidebarElement sidebarElement = _expandables[i] as ExpandableSidebarElement;
sidebarElement.Init();
sidebarElement.GetComponent <Button>().onClick.AddListener(() => toggle(sidebarElement));
sidebarElement.DummyButton.onClick.AddListener(() => toggle(sidebarElement));
}
}