diff --git a/tree_structure_provider/META-INF/plugin.xml b/tree_structure_provider/META-INF/plugin.xml
index e4498d56d..84a10e209 100644
--- a/tree_structure_provider/META-INF/plugin.xml
+++ b/tree_structure_provider/META-INF/plugin.xml
@@ -13,7 +13,7 @@
   <depends>com.intellij.modules.lang</depends>
 
   <extensions defaultExtensionNs="com.intellij">
-    <treeStructureProvider implementation="org.jetbrains.plugins.sample.CustomTreeStructureProvider"/>
+    <treeStructureProvider implementation="org.jetbrains.plugins.sample.tree.CustomTreeStructureProvider"/>
   </extensions>
 
   <application-components>
diff --git a/plugin_sample/src/org/jetbrains/plugins/sample/CustomTreeStructureProvider.java b/tree_structure_provider/scr/org/jetbrains/plugins/sample/tree/CustomTreeStructureProvider.java
similarity index 82%
rename from plugin_sample/src/org/jetbrains/plugins/sample/CustomTreeStructureProvider.java
rename to tree_structure_provider/scr/org/jetbrains/plugins/sample/tree/CustomTreeStructureProvider.java
index ed2d5c310..75cf50a37 100644
--- a/plugin_sample/src/org/jetbrains/plugins/sample/CustomTreeStructureProvider.java
+++ b/tree_structure_provider/scr/org/jetbrains/plugins/sample/tree/CustomTreeStructureProvider.java
@@ -1,4 +1,4 @@
-package org.jetbrains.plugins.sample;
+package org.jetbrains.plugins.sample.tree;
 
 import com.intellij.ide.projectView.TreeStructureProvider;
 import com.intellij.ide.projectView.ViewSettings;
@@ -15,7 +15,7 @@ import java.util.Collections;
 public class CustomTreeStructureProvider implements TreeStructureProvider {
     @NotNull
     @Override
-    public Collection<AbstractTreeNode> modify(@NotNull AbstractTreeNode abstractTreeNode, @NotNull Collection<AbstractTreeNode> collection, ViewSettings viewSettings) {
+    public Collection<AbstractTreeNode> modify(@NotNull AbstractTreeNode parent, @NotNull Collection<AbstractTreeNode> children, ViewSettings viewSettings) {
         return Collections.emptyList();
     }
 
diff --git a/tree_structure_provider/tree_structure_provider.iml b/tree_structure_provider/tree_structure_provider.iml
index 32a4474ae..e04b79911 100644
--- a/tree_structure_provider/tree_structure_provider.iml
+++ b/tree_structure_provider/tree_structure_provider.iml
@@ -5,6 +5,7 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/scr" isTestSource="false" />
     </content>
     <orderEntry type="jdk" jdkName="IDEA IU-140.1021" jdkType="IDEA JDK" />
     <orderEntry type="sourceFolder" forTests="false" />