Bizzare component behavior

Question

Hello,
I have created a custom component called a ChartCell based
off a tilelist. I have a SuperPanel (from
http://www.wietseveenstra.nl)
with a viewstack and a tabbar, with 4 types of ChartCells inside
(see code below).
I retrieve data from an external xml file and sort the data
based on types (in this case, glyph_form_type_id) into each
ChartCell using the populatePanels function.
the problem: if I only supply the first ChartCell with data,
(therefore, commenting out the other addItem methods in
populatePanels as illustrated below) everything works as expected.
But if i uncomment any other addItem (eg:
graphemes.dataProvider.addItem(i);) then a "cannot access a null
reference" error is thrown in the debugger. What completely baffles
me is, in the debugger->variables tab, the first chartCell
(phonemes) has a value of ChartCell, but the others (graphemes,
allophones, and sources) have a value of null! How can this be
possible? I've been banging my head over this for hours, please
help! (and let me know if you need any other information) Thanks in
advance

Answer 1

"bmilesp" <[email protected]> wrote in
message
news:glrkcs$4ku$[email protected]..
> Hello,
>
> I have created a custom component called a ChartCell
based off a tilelist.
> I
> have a SuperPanel (from
http://www.wietseveenstra.nl)
with a viewstack and
> a
> tabbar, with 4 types of ChartCells inside (see code
below).
> I retrieve data from an external xml file and sort the
data based on types
> (in
> this case, glyph_form_type_id) into each ChartCell using
the
> populatePanels
> function.
>
> the problem: if only supply the first ChartCell with
data, (therefore,
> commenting out the other addItem methods in
populatePanels as illustrated
> below) everything works as expected. But if i uncomment
any other addItem
> (eg:
> graphemes.dataProvider.addItem(i);) then a "cannot
access a null
> reference"
> error is thrown in the debugger. What completely baffles
my is, in the
> debugger->variables tab, the first chartCell
(phonemes) has a value of
> ChartCell, but the others (graphemes, allophones, and
sources) have a
> value of
> null! How can this be possible? I've been banging my
head over this for
> hours,
> please help! (and let me know if you need any other
information) Thanks in
> advance
http://www.magnoliamultimedia.com/flex_examples/Amys_Flex_FAQ.pdf
Q5
You may also find this example useful for other things you're
doing:
http://flexdiary.blogspot.com/2008/09/groupingcollection-example-featuring.html