freeFormDRLBtn.addClickHandler(btnsClickHandler);
fromBtn.addClickHandler(btnsClickHandler);
fromAccumulateBtn.addClickHandler(btnsClickHandler);
fromCollectBtn.addClickHandler(btnsClickHandler);
popup.addAttribute("", freeFormDRLBtn);
popup.addAttribute("", fromBtn);
popup.addAttribute("", fromAccumulateBtn);
popup.addAttribute("", fromCollectBtn);