/**
* Examines the list of menu items to determine whether <code>popup</code> is a popup menu.
*
* @param popup a <code>JPopupMenu</code>
* @return true if <code>popup</code>
*/
boolean isSubPopupMenu(JPopupMenu popup) {
int ncomponents = this.getComponentCount();
Component[] component = this.getComponents();
for (int i = 0; i < ncomponents; i++) {
Component comp = component[i];
if (comp instanceof JMenu) {
JMenu menu = (JMenu) comp;
JPopupMenu subPopup = menu.getPopupMenu();
if (subPopup == popup) return true;
if (subPopup.isSubPopupMenu(popup)) return true;
}
}
return false;
}
