Method _linkChildWidget

MyGUIEngine/src/MyGUI_Widget.cpp:1104–1109

	}

	void Widget::_linkChildWidget(Widget* _widget)
	{
		VectorWidgetPtr::iterator iter = std::find(mWidgetChild.begin(), mWidgetChild.end(), _widget);
		MYGUI_ASSERT(iter == mWidgetChild.end(), "widget already exist");
		addWidget(_widget);
	}

	void Widget::_unlinkChildWidget(Widget* _widget)
	{