public class ExampleViewContentprovide implements ITreeContentProvide {  

  
/** * Register content provider with model. */  
 public void inputChanged(Viewer viewer, Object oldInput, Object newInput)  
 {  
 if (newInput != null)  
    {   
this.viewer = viewer;  
this.model = (ExampleDelegate)newInput; this.model.addModelListener(this);   
}  
 }