* Create an action that moves a layer down in the rendering order
*/
private LayerAction moveFrontAction() {
frontAction = new LayerAction(){
public void run() {
getCurrentMap().sendCommandASync(new LayerMoveFrontCommand(currentMap, structSelection));
}
};
frontAction.setEnabled(false);
frontAction.setToolTipText(Messages.LegendView_front_tooltip);
frontAction.setImageDescriptor(ProjectUIPlugin.getDefault().getImageDescriptor(