GWT usage of Document.get().getElementById("main") vs RootPanel.get("main")

Hi , I am using GWT in my project and i came across this issue.. I have the container structure as below in my main html... If i try to access main directly with

RootPanel.get("main")

, i get an error "A widget that has an existing parent widget may not be added to the detach list".. It works fine, if i try to get "container", but any child element...(all in dev mode, it works fine in production)

<div id="container" class="container">
  <div id="topbar" class="topbar"></div>
  <div id="navbar" class="navbar"></div>
  <div id="main" class="main"></div>
  <div id="footer" class="footer"></div>
    </div>

I don't want to add all above n code now, say with HTMLPanel (its working, if i add one by one each HTMLPanel to container)....

Now i tried another approach of using this DOM parsing and adding a node..

Document.get().getElementById(GwtCnst.PANL_MAIN).appendChild(mainCanvas.getElement());

Please advise me on whether it will create a performance issue or any thing that i am missing.

Thanks

Jugunu

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