* Return this continuation if it is valid, or first valid parent
*/
private FOM_WebContinuation findValidParent(FOM_WebContinuation wk) {
if (wk != null) {
WebContinuation wc = wk.getWebContinuation();
while (wc != null && wc.disposed()) {
wc = wc.getParentContinuation();
}
if (wc != null) {
return new FOM_WebContinuation(wc);
}