Enable SaveAction from the Properties TopComponent

I managed to create my own Properties but now I'm struggling with the shortcuts...

The Netbeans Properties can be opened using Ctrl+Shift+7 so I tried to do the same using ActionReference.


Code:
@ActionReferences({
    @ActionReference(path = "Menu/Window", position = 800),
    @ActionReference(path = "Shortcuts", name = "DS-7")
})



It's working if I use DS-Y for example, but not with DS-7. It seems that I can't use a shortcut defined by a Netbeans TC.

Is there something special to do to reuse Ctrl+Shift+7 ?