You need to do the following:
1. Create an extended vardefs for Contacts where you will redefine the subpanel name for Accounts:
PHP Code:
<?PHP
$layout_defs['Contacts']['subpanel_setup']['accounts']['subpanel_name'] = 'ForContacts';
?>
2. Copy the file modules/Accounts/metadata/subpanels/default.php to modules/Accounts/metadata/subpanels/ForContacts.php
3. Edit this new file and replace this line
PHP Code:
array('widget_class' => 'SubPanelTopSelectButton', 'popup_module' => 'Accounts'),
By this one:
PHP Code:
array('widget_class' => 'SubPanelTopSelectButton', 'popup_module' => 'Accounts','mode'=>'MultiSelect'),
Go to Admin -> Repair -> Rebuild Extensions
Cheers
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