int GetDetailsItemHeight ()
{
int item_height;
int checkbox_height = CheckBoxes ? CheckBoxSize.Height : 0;
int small_image_height = SmallImageList == null ? 0 : SmallImageList.ImageSize.Height;
item_height = Math.Max (checkbox_height, text_size.Height);
item_height = Math.Max (item_height, small_image_height);
return item_height;
}