void UpdateChildren()
    {
        tk2dUILayoutContainerSizer sizer = (tk2dUILayoutContainerSizer)target;
        Transform t = sizer.transform;

        allActive = true;

        for (int i = 0; i < t.childCount; ++i)
        {
            Transform    c      = t.GetChild(i);
            tk2dUILayout layout = c.GetComponent <tk2dUILayout>();

            if (layout == null)
            {
                hasNonLayouts = true;
                break;
            }
        }

        foreach (tk2dUILayoutItem item in itemsList)
        {
            if (!item.inLayoutList)
            {
                allActive = false;
            }
        }
    }
    void AddMissingLayoutChildren(bool fixedSize)
    {
        tk2dUILayoutContainerSizer sizer = (tk2dUILayoutContainerSizer)target;

        foreach (tk2dUILayoutItem item in itemsList)
        {
            if (!item.inLayoutList)
            {
                item.inLayoutList   = true;
                item.fixedSize      = fixedSize;
                item.sizeProportion = 1;
                sizer.layoutItems.Add(item);
            }
        }
    }