How to detect overflowed text?

Hello,
I'd like to programatically detect overflowed text (ie. text which is not visible in its entirety). In reference guide I found that it should work be obtaining FP_Overflowed property of FO_SubCol, but it doesn't work for me. Here's sample document:
http://twoflower.matfyz.cz/inc/overflow_text.fm
How can I detect it properly?
Thank you.

Hi Stanislav...
I've used the following code to detect an overflow ..
F_ObjHandleT pageId = F_ApiGetId(FV_SessionId, docId, FP_FirstBodyPageInDoc);
while (pageId) {
F_ObjHandleT pageFrameId = F_ApiGetId(docId, pageId, FP_PageFrame);
F_ObjHandleT frameId = F_ApiGetId(docId, pageFrameId, FP_FirstGraphicInFrame);
F_ObjHandleT subcolId = F_ApiGetId(docId, frameId, FP_LastSubCol);
F_Printf(NULL, "pageFrameId %d; frameId %d; subcolId %d\n", pageFrameId, frameId, subcolId);
if (F_ApiGetInt(docId, subcolId, FP_Overflowed) == True) {
// do something
pageId = F_ApiGetId(docId, pageId, FP_PageNext);
When I run this on your file, it appears that your small overflowed textframe has no subcols, thus no place to check for the FP_Overflowed property. I'm not sure exactly why there would be no subcols (an Esc,g,o shows that it has one column .. ??).
Good luck,
...scott

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