Index: admin_templates/catalog/item_selector/item_selector_toolbar.tpl
===================================================================
--- admin_templates/catalog/item_selector/item_selector_toolbar.tpl	(revision 14888)
+++ admin_templates/catalog/item_selector/item_selector_toolbar.tpl	(working copy)
@@ -33,7 +33,15 @@
 					set_hidden_field('selected_ids[' + $prefix + ']', Grids[$Catalog.ActivePrefix].GetSelected());
 				</inp2:m_if>
 
-				submit_event('<inp2:m_Recall name="main_prefix"/>', 'OnProcessSelected');
+				var $opener = getWindowOpener(window);
+
+				if ( $.isFunction($opener.processItemSelector) ) {
+					$opener.processItemSelector('<inp2:m_Recall name="dst_field"/>', window);
+					window_close();
+				}
+				else {
+					submit_event('<inp2:m_Recall name="main_prefix"/>', 'OnProcessSelected');
+				}
 			}
 		) );
 	a_toolbar.AddButton( new ToolBarButton('cancel', '<inp2:m_phrase label="la_ToolTip_Cancel" escape="1"/>', function() {
Index: admin_templates/categories/category_path.tpl
===================================================================
--- admin_templates/categories/category_path.tpl	(revision 0)
+++ admin_templates/categories/category_path.tpl	(revision 0)
@@ -0,0 +1,15 @@
+<inp2:m_DefaultParam category_id=""/>
+
+<inp2:m_if check="m_Get" name="ajax" equals_to="yes">
+	<inp2:m_NoDebug/>
+	<inp2:m_Get name="category_id" result_to_var="category_id"/>
+</inp2:m_if>
+
+<inp2:m_DefineElement name="category_caption">
+	<inp2:m_ifnot check="m_Param" name="is_first">
+		<inp2:m_param name="separator"/>
+	</inp2:m_ifnot>
+	<inp2:m_param name="cat_name"/>
+</inp2:m_DefineElement>
+
+<inp2:c_CategoryPath cat_id="$category_id" separator=" &gt; " render_as="category_caption"/>
\ No newline at end of file
Index: admin_templates/incs/form_blocks.tpl
===================================================================
--- admin_templates/incs/form_blocks.tpl	(revision 14892)
+++ admin_templates/incs/form_blocks.tpl	(working copy)
@@ -534,18 +534,13 @@
 <inp2:m_DefineElement name="inp_edit_category" class="" size="" old_style="0" onkeyup="">
 	<inp2:m_RenderElement design="form_row" pass_params="1">
 		<td class="control-cell">
+			<inp2:m_RenderElement name="inp_edit_hidden" pass_params="1"/>
+
 			<table cellpadding="0" cellspacing="0">
 				<tr>
 					<td id="<inp2:{$prefix}_InputName field='$field'/>_path"<inp2:m_ifnot check="Field" name="$field" db="db"> style="display: none;"</inp2:m_ifnot>>
-						<inp2:m_DefineElement name="category_caption">
-							<inp2:m_ifnot check="m_Param" name="is_first">
-								<inp2:m_param name="separator"/>
-							</inp2:m_ifnot>
-							<inp2:m_param name="cat_name"/>
-						</inp2:m_DefineElement>
-
-						<inp2:$prefix_FieldCategoryPath field="$field" separator=" &gt; " render_as="category_caption"/>
-						<inp2:m_RenderElement name="inp_edit_hidden" pass_params="1"/>
+						<inp2:$prefix_Field field='$field' db="db" result_to_var="category_id"/>
+						<inp2:m_include template="categories/category_path" category_id="$category_id"/>
 					</td>
 					<td valign="middle">
 						<img src="img/spacer.gif" width="3" height="1" alt=""/>
@@ -556,6 +551,12 @@
 			         	<a href="#" id="<inp2:{$prefix}_InputName field='$field'/>_disable_link"<inp2:m_ifnot check="Field" name="$field" db="db"> style="display: none;"</inp2:m_ifnot>><inp2:m_Phrase name="la_Text_Disable"/></a>
 
 			         	<script type="text/javascript">
+							function processItemSelector($field, $selector) {
+								var $item_ids = $selector.Grids['c'].GetSelected();
+
+								CategorySelector.setCategory($field, $item_ids.length ? $item_ids.shift() : '');
+							}
+
 							function CategorySelector() {
 							}
 
@@ -563,20 +564,26 @@
 								return jq('<inp2:{$prefix}_InputName field="#FIELD_NAME#"/>'.replace('#FIELD_NAME#', $field));
 							}
 
-							CategorySelector.disableCategory = function ($field) {
+							CategorySelector.setCategory = function ($field, $category_id) {
 								var $field_id = this.getField($field);
 
-				         		$('#' + $field_id).val('');
-				         		$('#' + $field_id + '_path, #' + $field_id + '_disable_link').hide();
+				         		$('#' + $field_id).val($category_id);
+
+								$('#' + $field_id + '_path').load(
+									'<inp2:m_Link template="categories/category_path" category_id="#ID#" no_amp="1" js_escape="1"/>'.replace('#ID#', $category_id),
+									function () {
+										$('#' + $field_id + '_path, #' + $field_id + '_disable_link').toggle( $category_id !== '' );
+									}
+								);
 							}
 
-			         		$(document).ready(
+							$(document).ready(
 								function() {
 									var $field_id = CategorySelector.getField('<inp2:m_Param name="field" js_escape="1"/>');
 
 									$('#' + $field_id + '_disable_link').click(
 										function ($e) {
-											CategorySelector.disableCategory('<inp2:m_Param name="field" js_escape="1"/>');
+											CategorySelector.setCategory('<inp2:m_Param name="field" js_escape="1"/>', '');
 
 											return false;
 										}
Index: units/categories/categories_event_handler.php
===================================================================
--- units/categories/categories_event_handler.php	(revision 14888)
+++ units/categories/categories_event_handler.php	(working copy)
@@ -331,6 +331,11 @@
 			if ($this->Application->RecallVar('user_id') != USER_ROOT) {
 				// apply permission filters to all users except "root"
 				$view_filters = Array ();
+
+				if ( !$this->Application->RecallVar('UserGroups') ) {
+					throw new Exception('User groups missing in c:SetCustomQuery method.');
+				}
+
 				$groups = explode(',',$this->Application->RecallVar('UserGroups'));
 
 				foreach ($groups as $group) {