swing - Java: JComboBox -> ScrollBar - change color -

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i'm working on small application. made jcombobox, , want change colours inside. changed colour background, foreground, arrowbutton, ... don't know how change colours scrollbar inside. 

comobox = new jcombobox();     comobox.setname("currencycombo");  defaultcomboboxmodel combomodel = new defaultcomboboxmodel(); combomodel.addelement("gagd"); combomodel.addelement("agg"); combomodel.addelement("ehgsy"); combomodel.addelement("cgafgy"); combomodel.addelement("cfadgy"); combomodel.addelement("ggafg"); combomodel.addelement("sgfsdg"); combomodel.addelement("ugfasdg"); combomodel.addelement("fasfasf"); comobox.setmodel(combomodel); comobox.setopaque(true);  uimanager.put( "combobox.disabledbackground", new java.awt.color(32, 34, 41)); uimanager.put( "combobox.disabledforeground", new java.awt.color(181, 181, 181)); uimanager.put( "combobox.background", new java.awt.color(32, 34, 41)); uimanager.put( "combobox.foreground", new java.awt.color(181, 181, 181)); uimanager.put( "combobox.selectionbackground", new java.awt.color(181, 181, 181)); uimanager.put( "combobox.selectionforeground", new java.awt.color(32, 34, 41));     comobox.setui(new basiccomboboxui(){    @override    protected jbutton createarrowbutton() {        jbutton arrowbutton = new basicarrowbutton(          basicarrowbutton.south,         new java.awt.color(32, 34, 41),          new java.awt.color(181, 181, 181),         new java.awt.color(181, 181, 181),         new java.awt.color(32, 34, 41));        arrowbutton.setborder(borderfactory.createlineborder(new java.awt.color(32, 34, 41)));        return arrowbutton;     }              });

i tried this: 

object obejct = currencycombo.getui().getaccessiblechild(currencycombo, 0);               component co = ((container) obejct).getcomponent(0) ;                       if( co instanceof jscrollpane){                             jscrollpane pane = (jscrollpane) co;                                     component[] components = pane.getcomponents();                             (component component : components) {                                 if(component instanceof jscrollbar)                                 {                                     jscrollbar jsb = (jscrollbar) component;                                     jsb.setbackground(color.red);                                     jsb.setforeground(color.blue);                                     jsb.setui(new basicscrollbarui());                                     jsb.updateui();                                 }                              }                        }

hej jakub, following code change background of scrollbar inside combobox:

edit: can access color of scrollbar in these ways:

uimanager.put("scrollbar.thumbhighlight", color...;          uimanager.put("scrollbar.thumbdarkshadow", color...;  uimanager.put("scrollbar.highlight", color...;  uimanager.put("scrollbar.trackhighlight", color...;

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