Disable table sorting for one column of a table created with EE's Table class?

Question

I'm building a fieldtype add-on, and it presents the data contained therein via a table. I'm using EE's Table class to generate the thing, and it's mostly working fine - columns are sortable, etc. However, one column is a checkbox (for selecting that row), and obviously I don't want it to be able to sort by that column.

According to the Table class documentation, I should be able to disable sorting like this:

$this->EE->table->set_columns(array(
    'code' => array('header' => 'Code'),
    'name'  => array('header' => 'Name'),
    '_check'  => array('header' => form_checkbox(), 'sort' => false)
));

When viewing the generated table, it looks like it's doing the right thing (the "no-sort" class):

<table cellspacing="0" cellpadding="0" border="0" class="mainTable" data-table_config="{removed for brevity}">
    <thead>
        <tr class="odd">
            <th data-table_column="code" class="header">Code</th>
            <th data-table_column="name" class="header">Name</th>
            <th class="no-sort header" data-table_column="_check">
                <input type="checkbox" class="toggle_all" value="true" name="select_all">
            </th>
        </tr>
    </thead>
    <tbody>
        ...
    </tbody>
</table>

However, the table is still sortable by the checkbox column.

With javascript disabled, the output code is:

<table cellspacing="0" cellpadding="0" border="0" class="mainTable" data-table_config="{removed for brevity}">
    <thead>
        <tr>
            <th data-table_column="code">Code</th>
            <th data-table_column="name">Currency Name</th>
            <th class="no-sort" data-table_column="_check">
                <input type="checkbox" class="toggle_all" value="true" name="select_all">
            </th>
        </tr>
    </thead>
    <tbody>
        ...
    </tbody>
</table>

I've looked at tables that have sorting disabled for one column (the Content -> Edit table of entries being the prime example), and it appears that the "header" class that is getting added to my table via javascript might be at fault, and the Entries table doesn't have that:

<thead>
    <tr class="even">
        <th data-table_column="entry_id">#</th>
        <th data-table_column="title">Title</th>
        <th class="no-sort" data-table_column="view">View</th>
        <th data-table_column="comment_total">Comments</th>
        <th data-table_column="screen_name">Author</th>
        <th data-table_column="entry_date" class="headerSortUp">Date</th>
        <th data-table_column="channel_name">Channel</th>
        <th data-table_column="status">Status</th>
        <th class="no-sort" data-table_column="_check">
            <input type="checkbox" class="toggle_all" value="true" name="select_all">
        </th>
    </tr>
</thead>

How do I do this properly?

EDIT: As requested, here's the full table generation code (simplified by removal of conditionals, etc):

$this->EE->table->set_columns(array(
    'code'      => array('header' => lang('code')),
    'name'      => array('header' => lang('name')),
    '_check'    => array(
        'header' => form_checkbox('select_all', 'true', FALSE, 'class="toggle_all"'),
        'sort' => FALSE
    )
));

$table_data = array();

// Iterate over the complete list of items to build each table row
foreach ($this->items as $code => $label)
{
    // Is $code found in the $data array?
    $checked = (in_array($code, $data)) ? TRUE : FALSE;

    // Prepare checkbox parameters
    $params = array(
        'name'      => $field_name.'[]',
        'id'        => $code,
        'value'     => $code,
        'checked'   => $checked,
        'class'     => 'toggle'
    );
    // Add row as array to table array
    $table_data[] = array(
        'code'      => form_label($code,$code),
        'name'      => form_label($label,$code),
        '_check'    => form_checkbox($params)
    );
} // End table rows loop

// With all rows prepared, buid complete table
$this->EE->table->set_data($table_data);
return $this->EE->table->generate();

Answer 1

I've done this before by removing the javascript sort function in my own addon's jquery file.

$('table.mainTable > thead th.no-sort').unbind();