System.Windows.Forms.CustomTabControl.OnMove C# (CSharp) Method

        protected override void OnMove(EventArgs e)
        {
            if (this.Width > 0 && this.Height > 0){
                if (this._BackImage != null){
                    this._BackImage.Dispose();
                    this._BackImage = null;
                }
            }
            base.OnMove(e);
            this.Invalidate();
        }