@Override
public void onClick(AjaxRequestTarget target) {
popupWindow.setInitialHeight( 375 );
popupWindow.setInitialWidth( 525 );
popupWindow.setTitle(new ParamResourceModel("chooseLayer", this));
popupWindow.setContent( new LayerListPanel(popupWindow.getContentId()) {
@Override
protected void handleLayer(LayerInfo layer, AjaxRequestTarget target) {
popupWindow.close( target );
entryProvider.getItems().add(