private ModuleSelectionSubFrame getOrCreateCategory(String category) {
if (categories.containsKey(category)) {
return categories.get(category);
} else {
MuseRelativeRect position = new MuseRelativeRect(
border.left() + 4,
border.top() + 4,
border.right() - 4,
border.top() + 32);
position.setBelow(lastPosition);
lastPosition = position;
ModuleSelectionSubFrame frame = new ModuleSelectionSubFrame(
category,
position);