public void setValue(final PropertyValue value) { if (value == null) { combobox.setSelectedItem(noneItem); return; } final PropertyValue[] cmdValue = new PropertyValue[1]; if (component != null && component.get() != null) { final DesignDocument document = component.get().getDocument(); document .getTransactionManager() .readAccess( new Runnable() { public void run() { cmdValue[0] = value.getComponent().readProperty(CommandEventSourceCD.PROP_COMMAND); } }); } if (cmdValue[0] == null) { return; } DesignComponent command = cmdValue[0].getComponent(); for (String key : values.keySet()) { DesignComponent tmpCommand = values.get(key); if (tmpCommand != null && tmpCommand.equals(command)) { combobox.setSelectedItem(key); break; } } }