TitlePanelControl.setTitlePanelBorderColor

Sets the color applied to the border surrounding the control, including the corners. Any valid value for the CSS color property can be used. Setting this property to null removes any existing value. Note that any inherited value from a parent control may still apply.

Examples:

 controls.TITLEPANEL1.titlePanelBorderColor = "#808080";
 controls.TITLEPANEL1.titlePanelBorderColor("green");