Get Hash Value with two methods.But the one works finely, the other one is Exception.

Hi Everyone!

   I had a question about geting a hash value,When I used the my directives.
   
   My method like this:

   package com.star.yxt.common.model;

   import ......;

   public class PageSizeModel implements TemplateMethodModel {

   private Map<String,Integer>  mapPageSize = new HashMap<String,Integer>;

   @Override  
    public Object exec(List args) throws TemplateModelException { 

    ..............    

    return mapPageSize;

   }
}

   My FLT template like this:

  <#macro drp_pagesize selectname modelname selected>
	<#assign tmpmodename=
(modelname!"com.star.yxt.common.model.PageSizeModel")?new()>					
	<select name="${selectname}" class="input">
		<#if tmpmodename??>
			<#assign keys=tmpmodename()?keys>
				<#list keys as key>
                                        ${tmpmodename().["$key"]}  <#-- It
does wok finely -->	
					${tmpmodename().key}     <#-- It doesn't work finely --> 
      .........


   I have saw the tutorial in FreeMarker websit.The tutorial indicate that
book["title"] equal book.title in the
templates.(http://freemarker.org/docs/dgui_template_exp.html#dgui_template_exp_var_hash).

   My question is why the expression ${tmpmodename().key} can't work. 

   Who can explain my puzzledom about this situation?
  
   Thanks!
   

    
                                        
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