GuiShowImgCtrl MouseDown

[Emera]

I was wondering how I would detect if I have clicked the image in the GuiShowImgCtrl so that I can use it as a button.

PHP Code:

//#CLIENTSIDE
function onCreated() {
  new GuiShowImgCtrl("Control_One") {
    x = 1300;
    y = 50;
    width = 35;
    height = 35;
    image = "bubble_icon.png";
    hint = "This is a button.";
  }
} 


I want to be able to click the image, and make something happen, but I don't know how to do that. Can anybody help out? Is it matter of checking if the mouse is over the image and then using onMouseDown?