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>

[Garkin]

If you want to make any control transparent in LUA, use SetAlpha(value), where value is number between 0 (transparent) and 1 (fully opaque).

QuestLurkerBG:SetAlpha(0.3)

Or you can completely hide control using SetHidden(true).

QuestLurkerBG:SetHidden(true)

If you want set transparency in XML use alpha="value". This example sets transparency for backdrop to 30%:

<Backdrop name="$(parent)BG" inherits="ZO_ThinBackdrop" alpha="0.3" />

To completely hide control in XML use hidden="true":

<Backdrop name="$(parent)BG" inherits="ZO_ThinBackdrop" hidden="true" />

[zireko]

Thank you Garkin it's working perfect now.

[circonian]

If you want to hide the entire control do what Garkin suggested.
But, just fyi there may be a case sometimes when you don't want to hide the entire control.

For example if you had a backdrop & you only wanted to see the border, but not the rest (center) of the control you could set its center color

centerColor="00000000"

and that would make the center transparent, but the border would still be visible.