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**UpdateThumb**

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The **UpdateThumb **method positions the scrollbar thumb and enables or disables the vertical scroll bar depending on the number of items in the browse list, the currently selected item, and the active step distribution method. See //Control Templates--BrowseBox// for more information on thumb behavior.

**Implementation:**

The AddSortOrder method sets the stepdistribution methods for the BrowseClass object.

**Example:**

** IF FIELD() = ?MyBrowse            !focus on browse list**

**  IF EVENT() = EVENT:NewSelection  !if new selection**

**   IF MyBrowse.TakeNewSelection()  !BrowseClass object handles it**

**    MyBrowse.UdateThumb            !Reposition the thumb**

**   END    **

**  END**

** END**