childImage.buttonMode = true;

var coneBlackMaterial:BitmapFileMaterial = new BitmapFileMaterial(thumb_url);
coneBlack = new Plane( coneBlackMaterial, 250, 200, 3, 3);
planes.push(coneBlack); // push Plane objects into storage array
trace(planes*); // reference Plane objects in storage array
var childImage = planes*;
rootNode.addChild(childImage);

Hi all
This new bitmap material object loads onto the stage fine.
But I am seeming to scratch my head when it comes to

adding
childImage.buttonMode = true;

and it is busting the whole gallery.

many thanks if you can help.

:rich: