public void OffsetChildContainerPosition(UiContainer container, Vector2 position)
 {
     if (ChildContainerPositions.ContainsKey(container))
     {
         ChildContainerPositions[container] += position;
     }
 }
 public void UpdateChildContainerPosition(UiContainer container, Vector2 position)
 {
     if (ChildContainerPositions.ContainsKey(container))
     {
         ChildContainerPositions[container] = position;
     }
 }
        public void AddChildContainer(UiContainer container, Vector2 relativePosition)
        {
            container.Parent = this;
            if (!ChildContainerPositions.ContainsKey(container))
            {
                ChildContainerPositions.Add(container, relativePosition);
            }

            if (!ChildContainers.Contains(container))
            {
                ChildContainers.Add(container);
            }
        }