code: public void setDefaultSRE(ISREInstall sre) {
  		if (sre == null) {
  			setSelection(new StructuredSelection());
  		} else {
  			setSelection(new StructuredSelection(sre));
  		}
  	}
docs: Sets the default SRE, possible <code>null</code>.
  
  @param sre the SRE or <code>null</code>