I want to add a new CustomAction button on my custom list in Sharepoint 2010, programmatically. (Bear in mind that I am still a bit new to SharePoint)

I've followed the instructions given on these pages, but still can't figure out how to do this:

http://msdn.microsoft.com/en-us/library/hh500259(v=office.14).aspx http://msdn.microsoft.com/en-us/library/cc768562(v=office.12).aspx

To start with I just wanted to add the "Bing it!" button from the first example to my already existing custom content list. But when I add a new CustomAction element in my project as described in the example, the button only appears on standard custom lists, and not on my custom content list.

What I gathered from the second example is that it wanted me to set the ID of my custom content type to the same as the content type I inherit from. So I tried setting it and the RegistrationId on my CustomAction to 0x01. But this only messed up the layout of my add/edit forms and still did not show the button.

From before I had the ID of the list as 0x01008d248abf95d04c7a86ef829bc968282a, so I tried setting the RegistrationId of the CustomAction to this, but again the button did not appear anywhere.

Adding the CustomAction with SharePoint Designer works fine, but I need to do it programmatically.

I dont really know where to go from here. What am I missing?

1 Answer 1


My issue was that I was setting the ID of the list to an ID with lower-case letters, as it seems unsupported.

Changing the ID (0x01008d248abf95d04c7a86ef829bc968282a) to upper-case (0x01008D248ABF95D04C7A86EF829BC968282A) and then setting the RegistrationId of the CustomAction to this ID worked like a charm.

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