disable the possibility to change the site of a existing shell user.

interface/web/sites/shell_user_edit.php

@@ -93,6 +93,13 @@ class page_action extends tform_actions {
 		} else {
 			$app->tpl->setVar("username_prefix", $shelluser_prefix);
 		}
+		
+		if($this->id > 0) {
+			//* we are editing a existing record
+			$app->tpl->setVar("parent_domain_id_disabled", 'disabled="disabled"');
+		} else {
+			$app->tpl->setVar("parent_domain_id_disabled", '');
+		}
 
 		parent::onShowEnd();
 	}

interface/web/sites/templates/shell_user_edit.htm

@@ -6,7 +6,7 @@
     <fieldset id="wf_area_shell_user"><legend>Shell User</legend>
       <span class="wf_oneField">
         <label for="parent_domain_id" class="wf_preField">{tmpl_var name='parent_domain_id_txt'}</label>
-        <select id="parent_domain_id" name="parent_domain_id">{tmpl_var name='parent_domain_id'}</select>
+        <select id="parent_domain_id" name="parent_domain_id" {tmpl_var name='parent_domain_id_disabled'}>{tmpl_var name='parent_domain_id'}</select>
       </span>
       <span class="wf_oneField">
         <label for="username" class="wf_preField">{tmpl_var name='username_txt'}</label>