function onSample() { var rootBox = scene.rootBox; if (rootBox) { var styleVar = rootBox.getStyle("margin"); if (styleVar && !styleVar.isNull) { var rectValue = styleVar.rectValue; if (rectValue) { var top = rectValue.top; if (top && !top.isNull) { shell.print("top = " + top.intValue); } } } } }