Is it possible to have a totally transparent button?

I have an image as the background of one of my windows, and I want to make certain areas clickable (sort of like an image map). I have placed the buttons over these areas transparently, and this works well. Apart from one small problem:

I have the following in my XML file, which makes the buttons transparent, but I get an annoying white border around the edge of the buttons which I can't seem to get rid of (it vanishes when the mouse hovers over the button and when the button is pressed, but returns when the mouse moves away). Any clues?

code:

---

            <Control xsi:type="ButtonControl" Id="BtnClose">
                <Position Left="215" Top="163" Width="76"/>
                <CustomGradient>
                    <Normal>
                        <Color1><Red>0</Red><Green>0</Green><Blue>0</Blue><Alpha>000</Alpha></Color1>
                        <Color2><Red>0</Red><Green>0</Green><Blue>0</Blue><Alpha>000</Alpha></Color2>
                        <Shadow>false</Shadow>
                    </Normal>
                    <Hot>
                        <Color1><Red>0</Red><Green>0</Green><Blue>0</Blue><Alpha>000</Alpha></Color1>
                        <Color2><Red>0</Red><Green>0</Green><Blue>0</Blue><Alpha>000</Alpha></Color2>
                    </Hot>
                    <Pushed>
                        <Color1><Red>0</Red><Green>0</Green><Blue>0</Blue><Alpha>000</Alpha></Color1>
                        <Color2><Red>0</Red><Green>0</Green><Blue>0</Blue><Alpha>000</Alpha></Color2>
                    </Pushed>
                </CustomGradient>
                <Caption>Close</Caption>            </Control>

---

Just put an image element with no image (or a static control with no content) and use the standard 'OnWindowidEvent_CtrlClicked()' event.

I looked at that but in the documentation it says:

The OnWindowidEvent_CtrlClicked event is fired when a ButtonControl, a CheckBoxControl, a RadioControl, a MenuButtonControl or a LinkControl is clicked.

So this wouldn't work.

Making an invisible button is simple, just give it a custom look instead of a custom gradient.

<CustomLook>

you give it a hot, normal and pushed thing as with the customgradientand if you leave the custom look tag empty, it'll be invisible, if you want text where the button is, just put a StaticControl inside the custom look tags.  Basically with custom look, you can make a button look like any other control or element.  You could scrap the image element and put it inside the custom look for the button instead.

Thanks alexp2_ad, that worked