if (collapse == null) {
collapse = new ToolButton("x-tool-" + icon);
panel.getHeader().addTool(collapse);
}
collapse.setData("panel", panel);
collapse.removeListener(Events.Select, collapseListener);
collapse.addListener(Events.Select, collapseListener);
panel.setData("collapseBtn", collapse);
panel.setData("init", "true");
}