Need to change height

        BindingList<MyPart> columnData;
        BindingList<MyPart> datasource;

        public RadForm1()
        {
            InitializeComponent();
            columnData = new BindingList<MyPart>();
            datasource = new BindingList<MyPart>();

            for (int i = 0; i < 5; i++)
            {
                datasource.Add(new MyPart("Part " + i + ";Part " + (i + 1) + ";"));
            }
            radGridView1.AutoGenerateColumns = false;
            radGridView1.DataSource = datasource;

            GridViewTextBoxColumn checkedDropDownListColumn = new GridViewTextBoxColumn();
            checkedDropDownListColumn.FieldName = "CurrentParts";
            checkedDropDownListColumn.Width = 200;

            this.radGridView1.Columns.Add(checkedDropDownListColumn);

            for (int i = 0; i < 10; i++)
            {
                columnData.Add(new MyPart("Part " + i));
            }

            this.radGridView1.EditorRequired += radGridView1_EditorRequired;

            this.radGridView1.CellEditorInitialized+=radGridView1_CellEditorInitialized;
        }

        private void radGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
        {
            RadCheckedDropDownListElement editor = e.ActiveEditor as RadCheckedDropDownListElement;
            if (editor !=null)
            {
                editor.DropDownMinSize = new Size(500, 400);
            }
        }
        
        void radGridView1_EditorRequired(object sender, EditorRequiredEventArgs e)
        {
            if (this.radGridView1.CurrentColumn.Index == 0)
            {
                RadCheckedDropDownListElement editor = new GridViewCheckedDropDownListEditor();
                editor.DataSource = this.columnData;
                editor.DisplayMember = "CurrentParts";
                e.Editor = editor;
            }
        }

        public class GridViewCheckedDropDownListEditor : RadCheckedDropDownListElement
        {
            public override object Value
            {
                get
                {
                    return this.Text;
                }
                set
                {
                    this.Text = value.ToString();
                }
            }
        }

        public class MyPart
        {
            public string CurrentParts { get; set; }
            public MyPart(string currentParts)
            {
                this.CurrentParts = currentParts;
            }
        }