only valid control function are here:
http://wiki.esoui.com/Controls#EditControl
because your reference is an edit control:
ZO_DefaultEditMultiLineForBackdrop
as far i see, ZOS running like this:
xml Code:
<Backdrop name="$(parent)DescriptionBody" inherits="ZO_MultiLineEditBackdrop_Keyboard">
<Dimensions x="550" y="150"/>
<Anchor point="TOPLEFT" relativeTo="$(parent)DescriptionTitle" relativePoint="BOTTOMLEFT" offsetY="10" />
<EditBox name="$(parent)Field" inherits="ZO_DefaultEditMultiLineForBackdrop ZO_EditDefaultText"/>
</Controls>
</Backdrop>
in the inherit there is ZO_EditDefaultText:
DescriptionBodyFieldText:SetColor(1,1,1,1)
maybe this works for the lua too:
page = WINDOW_MANAGER:CreateControlFromVirtual("someparent", someplace, "ZO_DefaultEditMultiLineForBackdrop ZO_EditDefaultText")
pageText:SetColor(1,1,1,1) ?