Action is not getting submitted in struts2.

Question

i am new to struts2, tiles. I have created remove.jsp popup window to remove the child objects associated with parent. When i click remove button in popup, removeConcern method is not getting called. what will be the problem. ?

Remove.jsp

<s:form action="removecrnfromprty.action">
<s:hidden name="propertyId" value="propertyId" />
 <div class="top">
 <div class="bg">

 <div class="titleleft"><strong><s:text
  name="removeConcern.title" /></strong></div>

 <div class="titleright"> <s:submit cssClass="btn" type="button"
  name="button.find"/><input type="button" value=<s:text name="button.cancel"/> class="btn" />&nbsp;&nbsp;</div>
 </div>

 <div class="pad"></div>


 <display:table name="lstEntities" uid="row" class="main">
  <display:column>
   <s:checkbox name="propertyConcernId" fieldValue="%{#attr.prtyCrnId}" />
  </display:column>
  <display:column property="concern.concernText"
   titleKey="common.concern" />
 </display:table>
 </div>
</s:form>


<action name="loadremovecrnfromprty"

method="getConcernForRemove" class="com.mmm.ehspreg2.web.action.findproperty.FindPropertyByPropertyAction"> loadremoveCrn loadremoveCrn

findPrtyByPrty loadremoveCrn loadremoveCrn findPrtyByPrty