# ComboBoxSelectedIndexChanged

The server-side **OnComboBoxSelectedIndexChanged** event occurs when the user clicks on item in the Combobox, causing a postback.

The event handler function receives two arguments:

1. The **RadRibbonBar** which has fired the event. This argument is of type object, but can be cast to the **RadRibbonBar** type.

2. An **EventArgs** object.This object has a number of properties for handling the request for the items:

   * **Index** – index of the newly selected item.

   * **Item** – the newly selected item.

   * **DropDown** – the DropDown which fired the event.

   * **Group** – the group in which the DropDown is placed.