how can I hide a ribbon item on project server 2010?

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SharePoint2010

how can I hide a ribbon item (specifically Ribbon.ContextualTabs.ProjectCenter.Home.ChangeProjectType) on project server 2010? I followed this link:
https://msdn.microsoft.com/en-us/library/office/gg549101(v=office.14).aspx[^]
It hides a ribbon item I want to, but it affects the functionality of the other ribbon items in the Tab; in a way that buttons don't be clicked and comboboxes don't be filled. Here is my command:

<CustomAction
    Id="Ribbon.ContextualTabs.ProjectCenter.Home.ChangeProjectType"
    Location="CommandUI.Ribbon"
    Title="Hides the ChangeProjectType button in the Project Center ribbon">
    <CommandUIExtension>
      <CommandUIDefinitions>
        <CommandUIDefinition Location="Ribbon.ContextualTabs.ProjectCenter.Home.ChangeProjectType"/>
      </CommandUIDefinitions>
    </CommandUIExtension>
  </CustomAction>