code: function( oldChild, newChild ) {
  		var size = oldChild.config[ this._dimension ];
  		lm.items.AbstractContentItem.prototype.replaceChild.call( this, oldChild, newChild );
  		newChild.config[ this._dimension ] = size;
  		this.callDownwards( 'setSize' );
  		this.emitBubblingEvent( 'stateChanged' );
  	}
docs: Replaces a child of this Row or Column with another contentItem
  
  @param   {lm.items.AbstractContentItem} oldChild
  @param   {lm.items.AbstractContentItem} newChild
  
  @returns {void}