Hide the "Project Site" Button on Project Schedule Page

Hi,

I want to hide the "Project Site" button on the project schedule page (schedule.aspx). Therefore I used the following custom action in elements.xml:

<CustomAction Id="RemoveRibbonButton" Location="CommandUI.Ribbon">
  <CommandUIExtension>
    <CommandUIDefinitions>
      <CommandUIDefinition Location="Ribbon.Tabs.PDP.Home.GoTo.GoToWorkspace" />
    </CommandUIDefinitions>
  </CommandUIExtension>
</CustomAction>

After feature activation the "Project Site" button is removed on every PDP page, except the scheduling page.

Any idea what might be wrong here?

Thanks.

Chris