FSX SP2 and no DirectX 10 preview

Sorry for bugging the forum with another question so soon.
I just installed SP2 for FSX. I at first thought the install would install DX10 also. I'm gathering that DX10 isn't actually out yet, thus SP2 is a preview of DX10. However, I'm unable to get the DX10 preview button to show up in graphics tab.
My two SLI vid cards are EVGA 8600 GTS. EVGA lists the card as fully DX10 supported.
Are my cards not actually supported, or did something go wrong with the SP2 install.
Again, thanks for any replies.
I just installed SP2 for FSX. I at first thought the install would install DX10 also. I'm gathering that DX10 isn't actually out yet, thus SP2 is a preview of DX10. However, I'm unable to get the DX10 preview button to show up in graphics tab.
My two SLI vid cards are EVGA 8600 GTS. EVGA lists the card as fully DX10 supported.
Are my cards not actually supported, or did something go wrong with the SP2 install.
Again, thanks for any replies.