How to get the children-item in listItem of a listView (Titanium)? - titanium

Question

I had defined an imageview in my layout for the individual items of a list, and they were set invisible. When I clicked a button, they will be show,but I can't get this action act. I want to achieve this effect. Here is my code:
//file:list_view_test.jade
Alloy
Window#win
Button#btn(title = "Show" onClick = "show_the_image_view")
ListView#list_view(defaultItemTemplate = "list_style")
Templates
ItemTemplate(name = "list_style")
View#item_view(bindId = "bind_item_view")
ImageView#image_view(bindId = "bind_image_view")
ListSection
ListItem(bind_item_view:backgroundImage = "/images/backgroundImage_1.png"
bind_image_view:image = "/images/unchecked_image.png")
ListItem(bind_item_view:backgroundImage = "/images/backgroundImage_2.png"
bind_image_view:image = "/images/unchecked_image.png")
//file:list_view_test.stss
#item_view{
width:100%;
height:10%
}
#image_view{
top:0;
left:0;
width:20%;
height:20%;
visible:false
}
//file:list_view_test.coffee
show_the_image_view = ->
if "Show" == $.btn.getTitle()
$.btn.setTitle("Hide")
//$.image_view.setVisible(true) (this code had been commented, cause it's wrong)
else if "Hide" == $.btn.getTitle()
$.btn.setTitle("Show")
//$.image_view.setVisible(false) (this code had been commented, cause it's wrong)
$.list_view.addEventListener('itemclick', = (e) ->
if e.itemIndex == 0
//$.image_view.setImage('/images/checked_image.png') (this code had been commented, cause it's wrong)
else if e.itemIndex == 1
//$.image_view.setImage('/images/checked_image.png') (this code had been commented, cause it's wrong)
Is there anyone who has a good method to solve the problem?