android - Why Listbox items change order position and colour background after do scrolling in Firemonkey? -

i developing multi-device application in firemonkey main class has listbox component items. each of these items has same custom style.

my problem when have many items in listbox , have scroll vertical see rest of items. in case, listbox has strange behaviour , when scroll after doing scroll down item's components (a button example) have changed background colour , items have changed order inside listbox.

for example, if had:

item 1

item 2

item 3

after scroll have:

item 2

item 3

item 1

this change random. each time different.

real example (process steps):

1. load main class listbox.

2. do vertical scrolling down see rest of items.

3. do vertical scrolling upward return top of list.

4. the items have changed position in listbox , button (component of each item) changes background color.

why have behaviour in listbox??

how can solve , listbox not change items order neither background colour of components?

i not know if there property block items inside listbox or similar ...

edit

this code create , initialize listbox items:

procedure trooms_form.formcreate(sender: tobject); var   ... begin     := 0;     while < numitems begin       //create listbox item        item := tlistboxitem.create(nil);        item.parent := mylistbox;        item.stylelookup := 'stylelbox';       //number        itemnumber := item.findstyleresource('btt_number') tbutton;        if assigned(itemnumber) begin            itemnumber.text := jsonnumber;            case jsoncolor of              0 : itemnumber.tintobject.tintcolor := talphacolors.chocolate;               1 : itemnumber.tintobject.tintcolor := talphacolors.gold;                    2 : itemnumber.tintobject.tintcolor := talphacolors.darkgreen;               3 : itemnumber.tintobject.tintcolor := talphacolors.deeppink;              end;          end;       //type        itemtype := item.findstyleresource('txtstyle_type') ttext;        if assigned(itemtype) begin          itemtype.text := jsontypename;        end;       //occupation        itemoccup := item.findstyleresource('txt_occupation') ttext;        if assigned(itemoccup) begin          itemoccup.text := jsonoccup;        end;       //dates        itemday := item.findstyleresource('txt_day') ttext;        if assigned(itemday) itemday.text := displayday;        itemdatestart := item.findstyleresource('txt_start') ttext;        if assigned(itemdatestart) itemdatestart.text := jsontimestart;        itemdateend := item.findstyleresource('txt_end') ttext;        if assigned(itemdateend) itemdateend.text := jsontimeend;       //item background        itembackgr := item.findstyleresource('background_item') trectangle;        if assigned(itembackgr) begin          itembackgr.fill.kind := tbrushkind.solid;          case jsonstatus of            0 : itembackgr.fill.color := talphacolors.white;                     1 : itembackgr.fill.color := talphacolors.lightgreen;                2 : itembackgr.fill.color := talphacolors.palegoldenrod;             3 : itembackgr.fill.color := talphacolors.lightcoral;                4 : itembackgr.fill.color := talphacolors.lightseagreen;             5 : itembackgr.fill.color := talphacolors.lightblue;                 6 : itembackgr.fill.color := talphacolors.lightgrey;               end;        end;         inc(i);     end; 

thanks attention.

edit 2. solution

listbox items change after doing scroll in firemonkey