+ // get the index of this item in the menu
+ const wxMenuItemList& items = m_parentMenu->GetMenuItems();
+ int pos = items.IndexOf(this);
+ wxCHECK_RET( pos != wxNOT_FOUND,
+ _T("menuitem not found in the menu items list?") );
+
+ // get the radio group range
+ int start,
+ end;
+
+ if ( m_isRadioGroupStart )
+ {
+ // we already have all information we need
+ start = pos;
+ end = m_radioGroup.end;
+ }
+ else // next radio group item
+ {
+ // get the radio group end from the start item
+ start = m_radioGroup.start;
+ end = items.Item(start)->GetData()->m_radioGroup.end;
+ }
+
+ // also uncheck all the other items in this radio group
+ wxMenuItemIter node = items.Item(start);
+ for ( int n = start; n <= end && node; n++ )
+ {
+ if ( n != pos )
+ {
+ node->GetData()->m_isChecked = false;
+ }
+ node = node->GetNext();
+ }