Why it got error when using splitLayoutPanel.getWidget(1) (centered widget) but ok if using "splitLayoutPanel.getWidget(0)" (west widget)?

Lokk at this code;

SplitLayoutPanel splitLayoutPanel=new SplitLayoutPanel();

splitLayoutPanel.addWest(new Label("west"), 200);

splitLayoutPanel.add(new Label("center"));

then 

Label myWestLb= (Label)splitLayoutPanel.getWidget(0); //this code is ok, no problem

Label myCentralLb= (Label)splitLayoutPanel.getWidget(1); //this code got error

Does anyone know how to get the Widget that was added into the center of SplitLayoutPanel?

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