Specifies whether the group is visible.
SetVisible(value: boolean): void
true if the group is visible; otherwise, false.
Use the SetVisible method to dynamically define a group's visible state on the client. The original item's visibility can be defined by using the NavBarGroup.ClientVisible property.
If a group's server NavBarGroup.Visible property is set to false, this group is not rendered into the web page at all, so it can't be manipulated on the client side.