Camera Raw - Enable RGB Tone Curves

In Camera Raw, the Tone Curve Channel selection is disabled.  How can I enable it to allow me to adjust specific colors in Camera Raw?
I’m using Photoshop CS5, Camera Raw version 6.7.0.339 on a Windows Vista 64 bit system, and my camera is a Nikon D90.
Thanks,
Jack

I don't think you can...ACR 6.7 was a crossover version tho have compatibility with LR 4 when it was released, as a result it was set to allow processing of certain features that were in LR 4 (and ACR 7). While the RGB curves show up dimmed, I don't think ACR 6.7 allows actually adjusting the RGB curves. I think the only way to get them is update to CS6 and ACR 7.x.

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       <dngclr:Y>0</dngclr:Y>
    </dngclr:Edit0>
    <dngclr:Edit1 rdf:parseType="Resource">
       <dngclr:X>17</dngclr:X>
       <dngclr:Y>26</dngclr:Y>
    </dngclr:Edit1>
    <dngclr:Edit2 rdf:parseType="Resource">
       <dngclr:X>34</dngclr:X>
       <dngclr:Y>44</dngclr:Y>
    </dngclr:Edit2>
    <dngclr:Edit3 rdf:parseType="Resource">
       <dngclr:X>51</dngclr:X>
       <dngclr:Y>60</dngclr:Y>
    </dngclr:Edit3>
    <dngclr:Edit4 rdf:parseType="Resource">
       <dngclr:X>68</dngclr:X>
       <dngclr:Y>74</dngclr:Y>
    </dngclr:Edit4>
    <dngclr:Edit5 rdf:parseType="Resource">
       <dngclr:X>85</dngclr:X>
       <dngclr:Y>89</dngclr:Y>
    </dngclr:Edit5>
    <dngclr:Edit6 rdf:parseType="Resource">
       <dngclr:X>102</dngclr:X>
       <dngclr:Y>105</dngclr:Y>
    </dngclr:Edit6>
    <dngclr:Edit7 rdf:parseType="Resource">
       <dngclr:X>119</dngclr:X>
       <dngclr:Y>120</dngclr:Y>
    </dngclr:Edit7>
    <dngclr:Edit8 rdf:parseType="Resource">
       <dngclr:X>136</dngclr:X>
       <dngclr:Y>135</dngclr:Y>
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       <dngclr:Y>183</dngclr:Y>
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       <dngclr:Y>200</dngclr:Y>
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       <dngclr:Y>218</dngclr:Y>
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       <dngclr:Y>236</dngclr:Y>
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       <dngclr:Y>255</dngclr:Y>
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