If you set to True, any submenu on the Smart Menu can be set to open automatically. To learn about how to do this, see the Ektron CMS400.NET Administrator Manual section “Menu Feature” > “Assigning Folders to a Menu.” 

If you set to False, even if all other conditions are present, submenus on a Smart Menu do not automatically open. This property lets you design pages whose submenus do not normally open by default. Under some circumstances, such submenus look cluttered.

[Bindable(true)]
[Category("Ektron")]
[Description("When true, menu will auto-open to show matching IDs or folder associations.")]
[TypeConverter(typeof(BooleanConverter))]
[DefaultValue(true)]
public bool EnableSmartOpen;

<Bindable(true)>
<Category("Ektron")>
<Description("When true, menu will auto-open to show matching IDs or folder associations.")>
<TypeConverter(typeof(BooleanConverter))>
<DefaultValue(true)>
Public Property EnableSmartOpen() As bool