     private func setupSubviews() {
         
         addSubview(backgroundView)
+        addSubview(topStackView)
         addSubview(contentView)
         addSubview(separatorLine)
-        contentView.addSubview(topStackView)
         contentView.addSubview(inputTextView)
         contentView.addSubview(leftStackView)
         contentView.addSubview(rightStackView)

    private var rightStackViewLayoutSet: NSLayoutConstraintSet?
    private var bottomStackViewLayoutSet: NSLayoutConstraintSet?
    private var contentViewLayoutSet: NSLayoutConstraintSet?
    
    // MARK: - Initialization
    

        }
    }
    
    /// A SeparatorLine that is anchored at the top of the MessageInputBar with a height of 1
    open let separatorLine = SeparatorLine()
    
    /**
