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Form Inheritence

Posted on 1997-05-20
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Last Modified: 2010-04-04
I have inherited a form that has a page control with several bit buttons on each page.  Each time the parent form is changed to move buttons from one page to another, I get an error when I try to open my inherited form that says "List index out of bounds".  I've seen this error before using list boxes, but there aren't any list boxes on either of the forms in this case.  After I "ok" the error, the pascal unit opens, but the form is not loaded.  I thought I would be able to figure out the problem if I could view the form as text, but I have no way of opening it in a readable format.  Normally when controls are just moved around on the same page in the parent form page control, my inherited form adjusts fine the next time I open it.
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Question by:kniffen
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by:kniffen
ID: 1336497
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sleach earned 20 total points
ID: 1336498
This error can also be generated by trying to access a TStringList or TStrings object.  Check the code for any "List" object.

The error occurs when you access an item of the list that does not exist.





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by:kniffen
ID: 1336499
None of the forms or controls involved use TStringList or TStrings objects.  The only controls involved are TBitBtn, TPageControl and TEdit.  I have scoured all of the related form and control pascal units.  Someone else here wondered if at a lower level, like internal Delphi control programming, that they may be storing the names of the pages in the page control in some kind of list and when I move buttons from one page to another, Delphi gets confused and can't resolve the change.  Thanks anyway.
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