Index: branches/5.3.x/core/admin_templates/js/ajax.js
===================================================================
diff -u -N -r15902 -r15961
--- branches/5.3.x/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 15902)
+++ branches/5.3.x/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 15961)
@@ -390,8 +390,19 @@
 }
 
 AjaxDropdownPreloader.prototype.getControl = function($field) {
-	var $id = this.InputMask.replace('#FIELD#', $field);
-	return document.getElementById($id);
+	var $mask = this.InputMask.replace('#FIELD#', '#FIELD_NAME#');
+
+	if ( $field == this.DependendField ) {
+		var $control = get_control($mask, $field);
+
+		if ( $control.tagName.toUpperCase() == 'SELECT' ) {
+			return $control;
+		}
+
+		return get_control($mask, $field, 'select');
+	}
+
+	return get_control($mask, $field);
 }
 
 AjaxDropdownPreloader.prototype.successCallback = function($request, $params, $object) {
@@ -409,17 +420,28 @@
 		var $child = $node.childNodes.item(i);
 		switch ($child.tagName) {
 			case 'option':
-				var opt_value = $child.getAttribute('value');
-				var title;
-				if (opt_value) { // value is passed explicically
+				var title,
+					$is_selected = false,
+					opt_value = $child.getAttribute('value');
+
+				if (opt_value) { // value is passed explicitly
 					title = $child.firstChild.nodeValue
 				}
 				else {
 					opt_value = $child.firstChild.nodeValue;
 					title = this.Titles[$child.firstChild.nodeValue];
 				}
+
 				this.addOption($dst_field, opt_value, title, $child.attributes);
-				if (!$dst_field.multiple && (opt_value == $selected_value)) {
+
+				if ( $dst_field.multiple ) {
+					$is_selected = $selected_value.indexOf('|' + opt_value + '|') != -1;
+				}
+				else {
+					$is_selected = opt_value == $selected_value;
+				}
+
+				if ($is_selected) {
 					$dst_field.options[$dst_field.options.length - 1].selected = true;
 				}
 				break;