Hello, im trying to use CheckBoxList to select the items that will be used on a MySQL WHERE IN clause. So far I have populated the CheckBoxList but have the following problems.

1. Everytime I click Submit the selected items clear
2. How can I default all the items when first loading the site?
3. How would I use the array on a WHERE IN clause?

MyReport.php

<?php
	// Require autoload.php from koolreport library
	require_once "../../koolreport/core/autoload.php";
	
	use \koolreport\processes\CalculatedColumn;
	use \koolreport\processes\Sort;
	use \koolreport\processes\AggregatedColumn;
	use \koolreport\processes\AccumulativeColumn;
	
	//Step 2: Creating Report class
	class MyReport extends \koolreport\KoolReport
	{
		use \koolreport\amazing\Theme;
		use \koolreport\inputs\Bindable;
		use \koolreport\inputs\POSTBinding;
		
		protected function defaultParamValues()
		{
			return array(
				"startDatePicker"=>date("Y-m-d 00:00:00"),
				"checkBoxList"=>array(),
			);
		}
		
		protected function bindParamsToInputs()
		{
			return array(
			"startDatePicker",
			"checkBoxList",
			);
		}
                ....
                public function setup()
		{
			
			$this->src('automaker')
			->query("SELECT 
					c.nombre AS conductor,
					g.confirmacion_local_conductor AS sucursal,
					SUM(IF(MONTH(g.eventtimemx) = 1, 1, 0)) AS Ene,
					SUM(IF(MONTH(g.eventtimemx) = 2, 1, 0)) AS Feb,
					SUM(IF(MONTH(g.eventtimemx) = 3, 1, 0)) AS Mar,
					SUM(IF(MONTH(g.eventtimemx) = 4, 1, 0)) AS Abr,
					SUM(IF(MONTH(g.eventtimemx) = 5, 1, 0)) AS May,
					SUM(IF(MONTH(g.eventtimemx) = 6, 1, 0)) AS Jun,
					SUM(IF(MONTH(g.eventtimemx) = 7, 1, 0)) AS Jul,
					SUM(IF(MONTH(g.eventtimemx) = 8, 1, 0)) AS Ago,
					SUM(IF(MONTH(g.eventtimemx) = 9, 1, 0)) AS Sep,
					SUM(IF(MONTH(g.eventtimemx) = 10, 1, 0)) AS Oct,
					SUM(IF(MONTH(g.eventtimemx) = 11, 1, 0)) AS Nov,
					SUM(IF(MONTH(g.eventtimemx) = 12, 1, 0)) AS Dic
					FROM tbl_guardian g
					INNER JOIN tbl_conductor c ON c.conductorid = g.conductor
					WHERE YEAR(g.eventtimemx) = :anio
					AND confirmacion_clasificacion IN ('somnolencia', 'bostezar')
					AND c.estatus = 1
					AND g.cla_fp <> 1
					AND g.conductor NOT IN (0, 22)
					AND g.confirmacion_local_conductor IN (:sucursales)
					GROUP BY conductor, sucursal")
			->params(array(
                        ":anio"=>		        $this->params["startDatePicker"],
		        ":sucursales"=>	$this->params["checkBoxList"]
                        ))
			->saveTo($source);