Serialize component properties in DesignTime

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        [System.ComponentModel.TypeConverter(typeof(ExpandableObjectConverter))]
        public DataGridViewColumnCollection GridColumns
        {
            set
            {   
                _GridColumns = value;             // need serializeing
            }

            get
            {
                if (_GridColumns == null)
                    _GridColumns = new DataGridViewColumnCollection(new DataGridView());
                return _GridColumns;
            }

        }

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public int Width
        {
            set
            {   
                _Width = value;                  //Does not need serializeing
            }

            get
            {
                if (_Width == null)
                    _Width = new DataGridViewColumnCollection(new DataGridView());
                return  _Width;
            }

        }