@UiHandler("delete")
void onClickDelete(ClickEvent e) {
//Window.alert("size of checkboxes:" + checkboxes.size());
if( Window.confirm("Delete all checked GPS traces?") )
{
eventBus.fireEvent( new OpenWaitModelDialogEvent("Deleting GPS traces", "This may take a few minutes.") );
deleteGPSTraces();
} else {
uncheckMasterCheckBox();
for (Iterator iterator = checkboxes.iterator(); iterator.hasNext();) {
CheckBox cb = (CheckBox) iterator.next();