Use the MinHeightList property to specify the minimum height of the control's drop down window. The property has effect only if the control's style is DropDown or DropDownList. Use the HeighList property to specify the height of the control's drop down window. Use the AllowSizeGrip property to specify whether the drop down portion of the control is resizable at runtime. Use the AllowHResize, AllowVResize properties to specify whether the width, height of the drop down portion of the control are resizable.