TGB 1.5 - sceneWindow2D object not accessible within the Editor

Hi,

I was discovering the behaviors and while trying to code a simple a background behavior centering a static sprite at camera position and resizing it to the window resolution, I found out that the SceneWindow2D object is not accessible anymore from within the TGB editor... (It was accessible with the version 1.1.3).

if (!isObject(BackgroundBehavior))
{
   %template = new BehaviorTemplate(BackgroundBehavior);
   
   %template.friendlyName = "Background";
   %template.behaviorType = "GUI";
   %template.description  = "Set a static sprite as background, centered on the camera position and sized properly";
}

function BackgroundBehavior::onBehaviorAdd(%this)
{
   %temp = sceneWindow2D.getWindowExtents();
   %posX = getWord(%temp, 0);
   %posY = getWord(%temp, 1);
   %sizeX = getWord(%temp, 2);
   %sizeY = getWord(%temp, 3);
   
   %this.owner.setPosition(%posX, %posY);
   %this.owner.setSize(%sizeX, %sizeY);
   %this.owner.layer = 31;
}

This code is working when I run the game...but not when fired from within the editor!