[]
Gets or sets the number of items displayed when the drop-down list is expanded.
int DropDownLines { get; set; }
Property DropDownLines As Integer
IDropDown dropDown = worksheet.Controls.AddDropDown(20, 20, 120, 20);
dropDown.Items.Add(new DropDownItem("Pending"));
dropDown.Items.Add(new DropDownItem("Approved"));
dropDown.DropDownLines = 4;
int lines = dropDown.DropDownLines;