how to replace navigation portlet with my own template in plone 4.3

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Python

can anyone tell how to replace a navigation portlet with my own template. I did like this

1. I created one new class for portlet in my .py file and its look like below

[CODE] class navigation_address(Renderer):
index = ViewPageTemplateFile('templates/portlet_address.pt')
[/CODE]


2. I registered the portlets in overrides.zcml like
[CODE]

<plone:portletrenderer xmlns:plone="#unknown">
portlet="plone.app.portlets.portlets.navigation.INavigationPortlet"
class=".browser.createPictMenu.navigation_address"
/>
[/CODE]