By default, the BookmarkWidth property is 0. The BookmarkWidth property shows or hides the bookmark bar on the control. Use the BookMarkBackColor and BookMarkBackColor2 properties to customize colors of the control's bookmark bar. The BookmarkImage property indicates the index of the icon to show a bookmark on the link. The BookmarkBorderColor property specifies the color to show the border of the bookmark bar. The user can bookmark/un-bookmark a line within the control by pressing the CTRL + F2 key. You can navigate through the control' bookmarks using the F2 or Shift + F2 key.