I'm trying to add a custom action in the
When I try with SPD, even if I can write
Ribbon.EditingTools.CPEditTab.Markup, the custom action is not displayed.
How can I add such custom action using either SPD or Powershell ?
I've also tried with a Powershell script like this :
Please note this is a custom action used for only one site. I'd like to avoid to create a feature for this purpose.