JQuery / JsPlump: toggle "hidden/visible" anchor with checkbox strarting from Hidden

i've wrote something using JsPlump Library.

I got three elements that start using

`display:none;` 

and then i use the typical Jquery code for make them appear flagging a checkbox:

input type="checkbox" id="nameCB" name="nameCB" value="on"

$('#nameCB').click(function(){
    this.checked?$('#elementID').show(1000):$('#elementID').hide(1000);

My problem is if i set an anchor for one of these elements:

jsPlumb.addEndpoint('elementID', {anchor:"BottomCenter" }, endpointOptions );

the anchor (in the default case is a gray circle) is always visible. I would like to make it visible ONLY when the element it is connected is visible.