I am unaware of any way to change this color. It is not user-definable, and is not located with in the CSS block of the view .xsl file. My guess is that it is part of the binary behavior (#default#MasterHelper) applied for the xdMaster CSS class.

Signature
Greg Collins [InfoPath MVP]
Please visit: http://www.InfoPathDev.com
Hi,
We have one Master Detail control in Infopath form.In master table when i
click any pericular record that record is getting shaded in "light gray"
colour.This colour shade is not necessary for our project and users of this
project also getting confusion that is read only field like(In our forms we
gave this colour for read only fields).How to change this colour?.Please help
me.

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Rajesh