I know this is a Simple XML transparent question but need some help.

[zireko]

All I'm trying to do is make this transparent when I delete it , it gives me a white box background.
I tried to look for the api for backdrops and couldn't find them in the main api list , also I tried looking it up in zgoo but I may just be looking in the wrong places.

inherits="ZO_ThinBackdrop"

here is my xml currently

<GuiXml>
    <Controls>
        <TopLevelControl name="QuestLurker" mouseEnabled="true" movable="true" hidden="false" resizeToFitDescendents="true">        
                <Controls>
                <Backdrop name="$(parent)BG" inherits="ZO_ThinBackdrop" excludeFromResizeToFitExtents="true">
                    <AnchorFill />
                </Backdrop>
                
                <Label name="$(parent)Quest" font="ZoFontWindowTitle" color="CFDCBD" wrapMode="ELLIPSIS" verticalAlignment="CENTER" horizontalAlignment="CENTER">
                    <Anchor point="CENTER" realtiveTo="$(parent)" realtivePoint="CENTER" offsetX="0" offsetY="0" />
                </Label>
            </Controls>
        </TopLevelControl>
    </Controls>
</GuiXml>