ISV.config in CRM 4.0

I recently wanted to add a button in CRM 4.0:

In CRM 4.0 there is no ISV.config in the _resources folder like CRM 3.0. CRM 4.0 is multi-tennant and each tennant can have a unique isv.config. So, You can find this file in  "export customization" view.

You can get this file by following the instructions below.

1.  Export current ISV config: Settings -> Customization -> Export Customizations and then select ISV Config and  

     press Export Selected Customizations.
2.  Save .zip file and Edit .xml file inside it.

Backup this file so that if you will do some thing wrong and will get some errors, then you can revert back to this working file.

Now add your customization ( Please see the SDK for more info). Save the file and import back it to the CRM 4.0 by following the instructions below.

3.  Import modified file from Settings -> Customization -> Import Customizations
4.   See your customizations!

if your UI customizations aren't showing up in the UI? Please see  my previous post where i gave the URL to resolve this problem.