/** get ready to close, set all local references to null, to assist garbage collection */
public void close() {
// we'll also try to remove all of the tools
final Enumeration<MenuItemInfo> iter = _theTools.elements();
while (iter.hasMoreElements()) {
final MenuItemInfo mn = iter.nextElement();
mn.close();
}
// clear the dangling reference to the undo buffer
_rightClicker.closeMe();
_toteAdapter = null;
// clear the file drop listener
if (_dropSupport != null) _dropSupport.removeComponent(getChart().getPanel());
_dropSupport.removeFileDropListener(this);
// now remove references to the tools themselves
_theTools.removeAllElements();
_theChart.close();
_theChart = null;
if (_theTote != null) {
_theTote.closeMe();
_theTote = null;
}
if (_theToolbar != null) _theToolbar.close();
_theToolbar = null;
_theProperties = null;
_theStatusBar = null;
_theSession = null;
}
