Custom Action does not appear in Documents tab for a custom list

Question

I am trying to add a custom action to Workflows group in Documents tab of a Custom List. Also, I am adding another action to the Edit Control Block of same list. Below is the code I am trying to add,

<CustomAction
Id="{D61E5C6A-88AF-4370-9D34-C1F8954F1C39}"
RegistrationType="List"
RegistrationId="10001"
ImageUrl="/_layouts/Images/formatmap16x16.png"
Location="EditControlBlock"
Sequence="100"
Title="Custom Action">
<UrlAction Url="http://www.google.com"/>
</CustomAction>

<CustomAction
Id="{D5FBFC13-59D2-4846-9326-E101C9E6BDB8}"
RegistrationType="List"
RegistrationId="10001"
Location="CommandUI.Ribbon.ListView"
Sequence="5"
Title="Custom Action">
<CommandUIExtension>
  <CommandUIDefinitions>
    <CommandUIDefinition
      Location="Ribbon.Documents.Workflow.Controls._children">
      <Button
        Id="{857E70AF-CD75-4e7d-A81B-2D54D2AC9C18}"
        ToolTipTitle="Custom Action"
        ToolTipDescription="Custom Action"
        Alt="Custom Action"
        Sequence="5"
        Command="OpenGoogle"
        Image32by32="/_layouts/images/availableworkflow.gif"
        Image16by16="/_layouts/images/availableworkflow.gif"
        LabelText="Custom Action"
        TemplateAlias="o1" />
    </CommandUIDefinition>
  </CommandUIDefinitions>
  <CommandUIHandlers>
    <CommandUIHandler Command="OpenGoogle" CommandAction="javascript:window.open('http://www.google.com')">     </CommandUIHandler>
  </CommandUIHandlers>
</CommandUIExtension>
 </CustomAction>

I can see the custom action in ECB of my custom list, but the custom action in Documents tab does not show up. The same code works if I set the RegistrationId = 101 for other document libraries. It also works if I change the Custom Action location to CommandUI.Ribbon.DisplayForm and the CommandUIDefinition to Ribbon.ListForm.Display.Actions.Controls._children and I can see custom action the Display form. But, I want it in the workflows group of Documents tab.

I don't understand what I am missing.

Answer 1

If you're using a custom content type in your custom list, an alternative way of registering the control is to set the registration type to ContentType and set the registration id to your custom content type id.

Otherwise, check that your list registration id of 10001 is correct.

Answer 2

For my working button I have this XML at the top, some differences with yours, so hope it might help you:

<CustomAction Id="XXXXXXXXXXXXXXXXX"
            RegistrationType="List"
            RegistrationId="{$ListId:Lists/dlWerkinstructies;}"
            Location="CommandUI.Ribbon"
            Sequence="10001"
            Title="Invoke &apos;rbnStartWFRemoveWerkinstr&apos; action">

What's RegistrationID in your XML is the sequence in my XML.