IBO 4.2.Hi
C++Builder 5 Professional update pack 1
Firebird 1.5RC3
Win2K service pack 3

Hi everybody!
I hope this isn't off topic.
I have a bug in my app with a TIB_Grid; some sequence makes ActiveControl to
be lost and the typical violation exception raises...
Well, then I've tried some debugging and digging into IBO source code to
find out what's happening, because the bug occurs at:
TIB_Query1->Cancel();
but, after adding C:\IBO4\ (my IBO source directory) to
Project->Options->Directories->DebugSourcePath and rebuild my app, I can
trace into some IBO units, and some others not!
For example, I can step OK through IBA_Dataset.imp, but I can't step through
IBA_DataSource.imp. It's to say, if I press F7 in a call to
TIB_DataSource->Reset();
the debugger show me the IB_Components.pas and nothing else...
Anybody knows why? The file IBA_DataSource.imp is Ok and it's on the right
folder.
Is there some limitation about debugging Pascal code on Builder?
Any help will be appreciated. Many thanks,

Hugo.