By default, the OverviewHeight property is 24 pixels. If the OverviewHeight property is 0, or the OverviewVisible property is False, the chart's overview area is hidden. The OverviewBackColor property specifies the background color for the overview area. Use the OverviewSelBackColor property to change the visual appearance of the selection in the overview area. The OverviewToolTip property specifies the format of the tooltip being displayed when the cursor hovers the overview area. The OverviewLevelLines property indicates the index of the level that displays the grid lines in the overview area.