setChildsProperty(prop, value, recursive) {
		this.forEach((child) => {
			if (recursive === true && child instanceof Container) {
				child.setChildsProperty(prop, value, recursive);
			}
			child[prop] = value;
		});
	}
Automatically set the specified property of all childs to the given value
@param {string} prop - property name
@param {object} value - property value
@param {boolean} [recursive=false] - recursively apply the value to child containers if true