Change CheckBox Style in Android

I am having troubles changing the chexbox theme of a Alert Dialog. I am not able to change selected checkbox color to my AccentColor.

this is my style code

<style name="AlertDialogCustom" parent="Theme.AppCompat.Light.Dialog.Alert">      
<item name="android:checkboxStyle">@style/CustomCheckBox</item>
</style>
<style name="CustomCheckBox"     parent="android:style/Widget.CompoundButton.CheckBox">
<item name="android:button">@drawable/activated_checkbox</item>
</style>

Selector : activated_checkbox

 <?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://ift.tt/nIICcg">
<!-- checked -->
<item android:state_checked="true" android:drawable="@color/AccentColor">
</item>
<item android:state_checked="false" android:drawable="@color/White">
</item>
</selector>

and method that shows the AlertDialog.

private void showDialog() {

    final CharSequence[] items = getResources().getStringArray(R.array.tipoDescargas);
    final boolean[] states = {false, false, false};
    AlertDialog.Builder builder = new AlertDialog.Builder(this,R.style.AlertDialogCustom);
    builder.setTitle(getResources().getString(R.string.preguntaDescargas));
    builder.setMultiChoiceItems(items, states, new DialogInterface.OnMultiChoiceClickListener() {
        public void onClick(DialogInterface dialogInterface, int item, boolean state) {
        }
    });
    builder.setPositiveButton("Descargar", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            SparseBooleanArray CheCked = ((AlertDialog) dialog).getListView().getCheckedItemPositions();
            if (CheCked.get(0) && CheCked.get(1) && CheCked.get(2))
                Toast.makeText(getApplication(), "TODOS", Toast.LENGTH_SHORT).show();
            if (CheCked.get(0)) {
                Toast.makeText(getApplication(), "Item 1", Toast.LENGTH_SHORT).show();
            }
            if (CheCked.get(1)) {
                Toast.makeText(getApplication(), "Item 2", Toast.LENGTH_SHORT).show();
            }
            if (CheCked.get(2)) {
                Toast.makeText(getApplication(), "Item 3", Toast.LENGTH_SHORT).show();
            }
        }
    });
    builder.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            dialog.cancel();
        }
    });builder.create().show();
}

Can anyone help me? Thank you