Empty space of rendered=false commandButtons

[terrex30]

I have eight commandButtons and under some conditions, some of them are showing (by rendered) but I have a panelGrid so I don't know if there is some attribute to re-oriented the buttons that are showing like in order.
The view is something like this
| x x - x |
| x - x x |

And I would like to be

| x x x x |
| x x - - |

(x's are buttons and minus are empty spaces).
I hope someone can help me.

[Melloware]

Yep you need to just render a spacer there if the button is NOT rendered to keep the spacing.

[jepsar]

Or wrap them...