I've got a listbox with a list of about 4,000 items. For all the listbox
drawing commands we use a simple callback function to simply draw items to
the listbox depending on user criteria. In Palm OS 3.5 we have a strange
problem where just after the callback function is done all the listbox
drawing functions will randomly erase items off the listbox. They're still
marked as visible yet they don't show up on the screen. I know that it's
not the callback function as I've placed breakpoints at the end of the
function to watch the values dance through. At the very end of the last
iteration of the callback function everything is displayed correctly on the
listbox and in between the time it takes for the listbox command to return
to the previous code it suddenly erases much of the items in the listbox.
Has anyone else had this problem? If so, have you found acceptable
workarounds? I've tried various combinations of the listbox routines from
list.h and nothing seems to work.
We only have this problem with OS 3.5. All the other OSes work as they
should.
Thanks,
Michael Ryan
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