public sealed class XRadDropDownList : RadDropDownList
    {
        public XRadDropDownList()
        {
            DropDownStyle             = RadDropDownStyle.DropDownList;
            ListElement.AutoSizeItems = true;
        }

        protected override RadDropDownListElement CreateDropDownListElement()
        {
            return new XRadDropDownListElement();
        }

        public override string ThemeClassName => typeof(RadDropDownList).FullName;
        
        private sealed class XRadDropDownListElement : RadDropDownListElement
        {
            public override void DpiScaleChanged(SizeF scaleFactor)
            {
                _skipFocusFlag = true;
                base.DpiScaleChanged(scaleFactor);
                _skipFocusFlag = false;
            }

            public override bool Focus()
            {
                if (_skipFocusFlag)
                    return false;
                return base.Focus();
            }

            #region Properties

            protected override Type ThemeEffectiveType => typeof(RadDropDownListElement);

            #endregion

            #region Fields

            private bool _skipFocusFlag;

            #endregion
        }
    }