public void SetMapState(MapState mapState)
{
mMapState = mapState;
// TODO - Take in a tree to parse
// We kind of do now, but need to move MapState
// into the overall map manager, should not be
// in the UI manager.
TreeNode <MapItem> mapRoot = mMapState.GetMapTree();
ClearTree();
mTreeRoot = SetupTree(mapRoot);
UpdateUI();
mNumUpdates = 0;
}