class TreeMultiItemBase
!!!161026.cpp!!!	TreeMultiItemBase(inout parent : TreeMultiItemNode)
    // TODO: Enter your constructor code here
!!!161154.cpp!!!	~TreeMultiItemBase()
    // TODO: Enter your destructor code here
!!!163330.cpp!!!	IsVisible() : bool
	// are we excluded? then we are not visible as well

	if(IsExcluded())
		return false;

	// check every parent up until the last and if one of them is collapsed
	// we are not visible

	TreeMultiItemNode *p = GetParent();
	while(p)
	{
		if(!p->IsExpanded())
			return false;
		else
			p = p->GetParent();
	}

	return true;