diff --git a/src/DependencyTree/CMakeLists.txt b/src/DependencyTree/CMakeLists.txt
index b57dce943..91580628d 100644
--- a/src/DependencyTree/CMakeLists.txt
+++ b/src/DependencyTree/CMakeLists.txt
@@ -31,6 +31,7 @@ INCLUDE_DIRECTORIES(
   ${PROJECT_SOURCE_DIR}/src/OBJECT
   ${PROJECT_SOURCE_DIR}/src/GEOMUtils
   ${PROJECT_SOURCE_DIR}/src/GEOMClient
+  ${PROJECT_SOURCE_DIR}/src/GEOMToolsGUI
   ${PROJECT_BINARY_DIR}/idl 
   )
 
diff --git a/src/DependencyTree/DependencyTree_ViewModel.cxx b/src/DependencyTree/DependencyTree_ViewModel.cxx
index 74bf9f2c4..3c03d67ac 100644
--- a/src/DependencyTree/DependencyTree_ViewModel.cxx
+++ b/src/DependencyTree/DependencyTree_ViewModel.cxx
@@ -31,6 +31,7 @@
 
 // GEOM includes
 #include <GEOM_Displayer.h>
+#include <GEOMToolsGUI_ReduceStudyDlg.h>
 
 // QT includes
 #include <QMenu>
@@ -112,6 +113,18 @@ void DependencyTree_ViewModel::onShowOnlySelected()
   }
 }
 
+//=================================================================================
+// function : onReduceStudy()
+// purpose  : slot for showing dialog box "Reduce Study"
+//=================================================================================
+void DependencyTree_ViewModel::onReduceStudy()
+{
+  DependencyTree_View* viewPort = dynamic_cast<DependencyTree_View*>( getActiveViewPort() );
+  QDialog* dlg = new GEOMToolsGUI_ReduceStudyDlg( viewPort );
+  if( dlg != NULL )
+    dlg->show();
+}
+
 //=================================================================================
 // function : contextMenuPopup()
 // purpose  : process calling of context menu popup
@@ -127,7 +140,9 @@ void DependencyTree_ViewModel::contextMenuPopup( QMenu* theMenu )
       theMenu->clear();
       theMenu->addAction( tr( "MEN_DISPLAY" ), this, SLOT( onShowSelected() ) );
       theMenu->addAction( tr( "MEN_DISPLAY_ONLY" ), this, SLOT( onShowOnlySelected() ) );
-      theMenu->addAction( tr( "REBUILD_THE_TREE"), viewPort, SLOT( onRebuildModel() ) );
+      theMenu->addAction( tr( "MEN_REBUILD_THE_TREE"), viewPort, SLOT( onRebuildModel() ) );
+      theMenu->addSeparator();
+      theMenu->addAction( tr( "MEN_REDUCE_STUDY" ), this, SLOT( onReduceStudy() ) );
     }
   }
 }
diff --git a/src/DependencyTree/DependencyTree_ViewModel.h b/src/DependencyTree/DependencyTree_ViewModel.h
index 910afb236..afbfc0da0 100644
--- a/src/DependencyTree/DependencyTree_ViewModel.h
+++ b/src/DependencyTree/DependencyTree_ViewModel.h
@@ -39,6 +39,7 @@ private slots:
 
   void          onShowSelected();
   void          onShowOnlySelected();
+  void          onReduceStudy();
 
 };
 
diff --git a/src/DependencyTree/resources/DependencyTree_msg_en.ts b/src/DependencyTree/resources/DependencyTree_msg_en.ts
index a4a763781..c1c04a16d 100644
--- a/src/DependencyTree/resources/DependencyTree_msg_en.ts
+++ b/src/DependencyTree/resources/DependencyTree_msg_en.ts
@@ -33,8 +33,12 @@
     </message>
   <name>DependencyTree_ViewModel</name>
     <message>
-      <source>REBUILD_THE_TREE</source>
+      <source>MEN_REBUILD_THE_TREE</source>
       <translation>Rebuild the tree</translation>
     </message>
+    <message>
+      <source>MEN_REDUCE_STUDY</source>
+      <translation>Reduce study</translation>
+    </message>
 </context>
 </TS>
diff --git a/src/DependencyTree/resources/DependencyTree_msg_fr.ts b/src/DependencyTree/resources/DependencyTree_msg_fr.ts
index ab3e08246..ffeb404bc 100644
--- a/src/DependencyTree/resources/DependencyTree_msg_fr.ts
+++ b/src/DependencyTree/resources/DependencyTree_msg_fr.ts
@@ -33,8 +33,12 @@
     </message>
   <name>DependencyTree_ViewModel</name>
     <message>
-      <source>REBUILD_THE_TREE</source>
+      <source>MEN_REBUILD_THE_TREE</source>
       <translation type="unfinished">Rebuild the tree</translation>
     </message>
+    <message>
+      <source>MEN_REDUCE_STUDY</source>
+      <translation type="unfinished">Reduce study</translation>
+    </message>
 </context>
 </TS>
diff --git a/src/DependencyTree/resources/DependencyTree_msg_ja.ts b/src/DependencyTree/resources/DependencyTree_msg_ja.ts
index 1f3400058..642f04c6a 100644
--- a/src/DependencyTree/resources/DependencyTree_msg_ja.ts
+++ b/src/DependencyTree/resources/DependencyTree_msg_ja.ts
@@ -33,8 +33,12 @@
     </message>
   <name>DependencyTree_ViewModel</name>
     <message>
-      <source>REBUILD_THE_TREE</source>
+      <source>MEN_REBUILD_THE_TREE</source>
       <translation type="unfinished">Rebuild the tree</translation>
     </message>
+    <message>
+      <source>MEN_REDUCE_STUDY</source>
+      <translation type="unfinished">Reduce study</translation>
+    </message>
 </context>
 </TS>
\ No newline at end of file
diff --git a/src/GEOMToolsGUI/GEOMToolsGUI_1.cxx b/src/GEOMToolsGUI/GEOMToolsGUI_1.cxx
index 68ed62133..2ca503aae 100644
--- a/src/GEOMToolsGUI/GEOMToolsGUI_1.cxx
+++ b/src/GEOMToolsGUI/GEOMToolsGUI_1.cxx
@@ -904,7 +904,6 @@ void GEOMToolsGUI::OnShowDependencyTree()
 void GEOMToolsGUI::OnReduceStudy()
 {
   QDialog* dlg = new GEOMToolsGUI_ReduceStudyDlg( SUIT_Session::session()->activeApplication()->desktop() );
-  if ( dlg != NULL )
+  if( dlg != NULL )
     dlg->show();
-
 }