SharePoint - CustomAction does not appear on toolbar for content type

Question

I created a function with a content type:

<ContentType ID="0x01007C963A8770A24bbfBDBCE157B96EE769"
             Name="Send" Group="Demo" Version="1">
</ContentType>

I want to create custom actions for this type of content.
This works in ECB (pop-up menu for each header):

<CustomAction
    Id="Demo.Send.PopupMenu"
    Title="Send"
    Location="EditControlBlock"
    Description="Hold"
    RegistrationType="ContentType"
    RegistrationId="0x01007C963A8770A24bbfBDBCE157B96EE769">
      <UrlAction Url="http://www.google.com/search?q={ItemId} Cookies"/>
</CustomAction>

However, I cannot get it to work with form toolbars (edit or display):

<CustomAction
    Id="Demo.Send.DisplayFormToolbar"
    Title="Send"
    Location="DisplayFormToolbar"
    Description="Send"
    RegistrationType="ContentType"
    RegistrationId="0x01007C963A8770A24bbfBDBCE157B96EE769"
    Sequence="108">
       <UrlAction Url="http://www.google.com/search?q={ItemId} Cookies"/>
</CustomAction>

I do not receive an error message, I just do not see the button.
It works if I change RegistrationIdto 0x01, but then I see it in all types of content (all elements, really).

Any idea what is wrong with this code?

Answer 1

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Try

RegistrationId="0x01007C963A8770A24BBFBDBCE157B96EE769"

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