public void createControls(Composite parent) {
this.top = parent;
// create some managers...
CoolBarManager	coolbarmgr = new CoolBarManager(SWT.NONE);
IToolBarManager toolbarmgr = new ToolBarManager(SWT.FLAT | SWT.BOTTOM);
CoolBar coolbar1 = coolbarmgr.createControl(top);
ToolBar toolBar1 = new ToolBar(coolbar1, SWT.FLAT);
coolbarmgr.add(new ToolBarContributionItem(toolbarmgr));

// create a nice tool item
createToolItem(toolBar1, CommandIds.CMD_SOMETHING, 
				Icon.MY_ICON.getImage(IconSize.ToolbarIconSize), preferences.getBoolean(Constants.TOOLBAR_SHOW_SOMETHING));

ToolItem item = new ToolItem(toolBar, SWT.PUSH);
// some item configurations

protected void recreateCoolBar() {
// doesn't work :-( => the coolbar is completely empty after re-creating...
  coolbarmgr.removeAll();
  createControls(top);
}