+ public boolean isVisible() {
+ if (un1 != null)
+ return un1.isVisible();
+ if (un2 != null)
+ return un2.isVisible();
+ if (un3 != null)
+ return un3.isVisible();
+ return false;
+ }
+
+ public void setVisible(boolean visible) {
+ if (un1 != null)
+ un1.setVisible(visible);
+ if (un2 != null)
+ un2.setVisible(visible);
+ if (un3 != null)
+ un3.setVisible(visible);
+ }
+
+