making custom buttons do things at a DevExpress grid

How to make custom buttons in a DevExpress 13.1.9 Grid View do things in JavaScript:

<ClientSideEvents CustomButtonClick="function(s, e) {
   if(e.buttonID == 'whatever'){
      alert('whatever: ' + e.visibleIndex);
   }
}" />
<Columns>
   <dx:GridViewCommandColumn Caption="Whatever" ButtonType="Image"
         VisibleIndex="1">
      <CustomButtons>
         <dx:GridViewCommandColumnCustomButton ID="whatever" Text="Whatever">
         </dx:GridViewCommandColumnCustomButton>
      </CustomButtons>
   </dx:GridViewCommandColumn>
</Columns>

 
 

s.keys[e.visibleIndex] could be substituted for e.visibleIndex to fish out the key for a row if a KeyFieldName setting was set. It's not the scenario above. Do things on the C# side with a CustomButtonCallback event like so:

private void MyGrid_CustomButtonCallback(object sender,
      ASPxGridViewCustomButtonCallbackEventArgs e)
{
   if (e.ButtonID == "View")
   {
      ASPxWebControl.RedirectOnCallback("Whatever.aspx");
   }
}

 
 

You cannot do a Response.Redirect within a callback, but .RedirectOnCallback is the DevExpress workaround.