使用click()，方法点击上传按钮，没有弹出框，请问这是什么问题？
我在上传图片的页面使用：dr.findElement(By.id("SWFUpload_0")).click();
但是没有弹出选择文件的对话框，请问是什么原因？<head>
<body id="question_answer_set">
<div class="" style="left: 0px; top: 0px; visibility: hidden; position: absolute;">
<div class="" style="left: 0px; top: 0px; visibility: hidden; position: absolute;">
<div id="header">
<div class="w1000 mb mt17 knowMainWrap clearfix f_y">
<div class="userPersonInfo clearfix">
<div class="personQuestionWrap mt38">
<ul class="navSort col_c clearfix">
<div class="pl20 pr20 ProposeQuestion mt17 clearfix">
<ul class="editPersonInfo mt17 pl20">
<li id="answerSet">
<li>
<span class="title">个人头像： </span>
<span class="upLoadImg mr10">
<img id="imgPath" width="120" height="120" src="http://192.168.0.7:8099/group1/M00/00/60/wKgAB1KEjmqTyVo_AAl5WLU-YRY600.jpg">
<i style="position: relative;top: -3px;left: 92px;">
<div id="imgChange" class="uploadify" style="height: 20px; width: 360px;">
<object id="SWFUpload_0" class="swfupload" width="360" height="20" data="/static/js/jq/uploadify/uploadify.swf?preventswfcaching=1387941546393" type="application/x-shockwave-flash" style="position: absolute; z-index: 1;">
<div id="imgChange-button" class="uploadify-button " style="height: 20px; line-height: 20px; width: 360px;">
</div>
<div id="imgChange-queue" class="uploadify-queue"></div>
</i>
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