function panel($wp_customize){
$wp_customize->add_panel('some_panel',array(
'title'=>'Panel1',
'description'=> 'This is panel Description',
'priority'=> 10,
));
$wp_customize->add_section('section',array(
'title'=>'section',
'priority'=>10,
'panel'=>'some_panel',
));
$wp_customize->add_setting('setting_demo',array(
'defaule'=>'a',
));
$wp_customize->add_control('contrl_demo',array(
'label'=>'Text',
'type'=>'text',
'section'=>'section',
'settings'=>'setting_demo',
));} add_action('customize_register','panel');