canvas.addStyleName("canvas");
editor.addComponent(canvas);
editor.setExpandRatio(canvas, 7);
// editor.addStyleName("no-vertical-drag-hints");
editor.addStyleName("editor");
editor.addStyleName("no-horizontal-drag-hints");
Label help = new Label("Drag items to the canvas");
help.addStyleName("help");
paletteLayout.addComponent(help);