Widget: Custom Post Type Post Listing Dropdown on Admin Side

Here is what I discovered and use, maybe it will help you:

function custom_posttype_dropdown($name, $selected)
{       
    $out = "";
    $posts = get_posts(
        array(
            'post_type'  => 'bctap_templates',
            'numberposts' => -1
        )
    );
    if($posts )
    {

        $out="<select name="".$name.'" ><option>Select a Template</option>';
        foreach( $posts as $p )
        {
            if ($p==$selected)
            {
                $selected = "selected = 'selected'";
            }
            else
            {
                $selected = "";
            }
            $out .= '<option value="' . $p->ID . '" '.$selected.'>' .$p->post_title  . '</option>';
        }
        $out .= '</select>';
    } 
    else
    {
        $out="<select name="".$name.'" value="x" ><option>Select a Option</option>';
        foreach( $posts as $p )
        {               
            $out .= '<option value="x" '.$selected.'>None Created Yet.</option>';
        }
        $out .= '</select>';
    }
    return $out;
}

//to call
echo custom_posttype_dropdown($name, $selected);