Optional Content The Optional Content page contains the following: Table 4. Optional Content Element Description Render Mode Allows you to render panel items in a specific mode, either as a panel or tree. The default render mode is PanelMode. Expand Effect Allows you to set the visual effect that is applied when the panel items are expanded or collapsed. The default expand effect is Linear. NOTE: Only works when the PanelMode option is selected to render panel items. Expand Group Indices Allows you to set the indices of the groups that are expanded initially when the page is loaded. The index starts with 0. For example, if you want to expand the first and the third groups, specify: 0, 2 Expand All Parent Menu Items on Load Allows you to expand all parent menu items when the page is loaded. Parent menu items are all menu items that contain sub menu items underneath it. If you set this to true, you do not have to define the Expanded Group Indices property since it will automatically expand the top level menu items as well. Expand Mode Allows you to set the behavior of the panels when one is expanded or collapsed. The default expand mode is MultipleExpandedItems. This expand mode enables you to expand multiple panels at the same time. NOTE: Only works when the PanelMode option is selected to render panel items.