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|  | **HasThumb** | **BYTE** |

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The **HasThumb **property indicates whether BrowseClass object's LIST control has a vertical scroll bar. A value of one (1) indicates a scroll bar; a value of zero (0) indicates no scroll bar.

**Implementation:**

The SetAlerts method sets the value of the HasThumb property. The UpdateThumb method uses the HasThumb property to implement correct thumb and scroll bar behavior.

**See Also:**     [[listcontrol  listbox control number .htm|ListControl]], [[setalerts  alert keystrokes for list and locator controls .htm|SetAlerts]], [[updatethumb  position the scrollbar thumb .htm|UpdateThumb]]