public class FABAction :
    FABActionBase

Public Class FABAction
    Inherits FABActionBase

<dx:ASPxFloatingActionButton ID="ASPxFloatingActionButton1" runat="server" ClientInstanceName="fab" ContainerElementID="content">
    <ClientSideEvents Init="OnInit" />
    <Items>
        <dx:FABAction ContextName="NewItemContext" Text="New Item">
        </dx:FABAction>
        ...
    </Items>
</dx:ASPxFloatingActionButton>