int pos = -1;
ToolbarData data = proj.getLogisimFile().getOptions().getToolbarData();
for (Tool tool : data.getContents()) {
++pos;
if (tool == null) {
newItems.add(new ToolbarSeparator(4));
} else {
ToolbarItem i = findItem(oldItems, tool);
if (i == null) {
newItems.add(new ToolItem(tool));
} else {