JScript intellisense with ScriptManagerProxy

I am having a problem generating ScriptManagerProxy scripts. When I add the ScriptManager everything works as expected and the scripts are displayed correctly, but whenever I change it to ScriptManagerProxy every script, even MicrosoftAjax.js, disappears from intellisense.

I believe there is some proxy bug, but someone can shed some light on how I can fix this. It's pretty tedious to change the ScriptManager to and from the proxy all the time.

By the way, I use custom controls with inline script resources if they have any value (it all works with a normal ScriptManager, so there is nothing wrong with the code).