diff --git a/qtviewer_planetosm/osm_frame_widget.cpp b/qtviewer_planetosm/osm_frame_widget.cpp
index 252820fe3f69dee6c62062456a9f38579e666848..0f6b8aae78dd98b0e3c3a8e3aa806238d0e28575 100644
--- a/qtviewer_planetosm/osm_frame_widget.cpp
+++ b/qtviewer_planetosm/osm_frame_widget.cpp
@@ -138,9 +138,7 @@ bool osm_frame_widget::eventFilter(QObject *obj, QEvent *event)
 		}
 		else if (obj == ui->dockWidget_QTV_side)
 		{
-			ui->dockWidget_QTV_side->hide();
-			QMargins m = this->layout()->contentsMargins();
-			this->layout()->setContentsMargins(m.left(),m.top(),12,m.bottom());
+			enableLiteMode(true);
 			return true;
 		}
 		else if (m_PropPageslayer.contains(obj))
@@ -198,10 +196,7 @@ void osm_frame_widget::mousePressEvent(QMouseEvent * e)
 	{
 		if (ui->dockWidget_QTV_side->isVisible()==false)
 		{
-			ui->dockWidget_QTV_side->show();
-
-			QMargins m = this->layout()->contentsMargins();
-			this->layout()->setContentsMargins(m.left(),m.top(),m.left(),m.bottom());
+			enableLiteMode(false);
 		}
 	}
 
@@ -429,3 +424,44 @@ void osm_frame_widget::on_pushButton_QTV_saveToFile_clicked()
 		}
 	}
 }
+void osm_frame_widget::enableLiteMode(bool bEnabled)
+{
+	if (bEnabled==true)
+	{
+		if (ui->tab_map->parent()==this)
+			return;
+		ui->tabWidget_main->hide();
+		int idx = ui->tabWidget_main->indexOf(ui->tab_map);
+		ui->tab_map->setParent(this);
+		if (idx>=0)
+			ui->tabWidget_main->removeTab(idx);
+		//remove topmost flag
+		Qt::WindowFlags flg = ui->tab_map->windowFlags();
+		flg &= ~(Qt::WindowMinMaxButtonsHint|Qt::WindowStaysOnTopHint|Qt::Window );
+		ui->tab_map->setWindowFlags(flg);
+		//add to current Layer
+		this->layout()->addWidget(ui->tab_map);
+		ui->tab_map->show();
+		ui->dockWidget_QTV_side->hide();
+		QMargins m = this->layout()->contentsMargins();
+		this->layout()->setContentsMargins(m.left(),m.top(),12,m.bottom());
+
+	}
+	else
+	{
+		Qt::WindowFlags flg = ui->tab_map->windowFlags();
+		flg &= ~(Qt::WindowMinMaxButtonsHint|Qt::WindowStaysOnTopHint|Qt::Window );
+		ui->tab_map->setWindowFlags(flg);
+		int idx = ui->tabWidget_main->addTab(
+					ui->tab_map,
+					"Map"
+					);
+		ui->tabWidget_main->setTabIcon(idx,ui->tab_map->windowIcon());
+		ui->tabWidget_main->show();
+		ui->tabWidget_main->setCurrentIndex(idx);
+		QMargins m = this->layout()->contentsMargins();
+		this->layout()->setContentsMargins(m.left(),m.top(),m.left(),m.bottom());
+		ui->dockWidget_QTV_side->show();
+
+	}
+}
diff --git a/qtviewer_planetosm/osm_frame_widget.h b/qtviewer_planetosm/osm_frame_widget.h
index d5c93506b4b1dc22ddb95d46d7adaf84da5e87dd..42010ccdf2d6e174b939326980ded42394278f2d 100644
--- a/qtviewer_planetosm/osm_frame_widget.h
+++ b/qtviewer_planetosm/osm_frame_widget.h
@@ -30,7 +30,7 @@ public:
 public:
 	//Get tile viewer
 	tilesviewer * viewer();
-
+	void enableLiteMode(bool bEnabled);
 protected:
 	bool eventFilter(QObject *obj, QEvent *event);
 protected:
diff --git a/qtviewer_planetosm/osm_frame_widget.ui b/qtviewer_planetosm/osm_frame_widget.ui
index f3b021d6962404054fca591d9a3c6d351b815422..8b701f6c0a36cfcf6fa909543da29194503de008 100644
--- a/qtviewer_planetosm/osm_frame_widget.ui
+++ b/qtviewer_planetosm/osm_frame_widget.ui
@@ -17,23 +17,23 @@
    <iconset resource="resource/resource.qrc">
     <normaloff>:/ui/icons/Folder Online aqua.png</normaloff>:/ui/icons/Folder Online aqua.png</iconset>
   </property>
-  <layout class="QGridLayout" name="gridLayout">
+  <layout class="QHBoxLayout" name="horizontalLayout_5">
+   <property name="spacing">
+    <number>1</number>
+   </property>
    <property name="leftMargin">
-    <number>0</number>
+    <number>1</number>
    </property>
    <property name="topMargin">
-    <number>0</number>
+    <number>1</number>
    </property>
    <property name="rightMargin">
-    <number>0</number>
+    <number>1</number>
    </property>
    <property name="bottomMargin">
-    <number>0</number>
+    <number>1</number>
    </property>
-   <property name="spacing">
-    <number>0</number>
-   </property>
-   <item row="0" column="0">
+   <item>
     <widget class="QTabWidget" name="tabWidget_main">
      <property name="tabPosition">
       <enum>QTabWidget::South</enum>
@@ -115,7 +115,7 @@
      </widget>
     </widget>
    </item>
-   <item row="0" column="1">
+   <item>
     <widget class="QDockWidget" name="dockWidget_QTV_side">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Fixed" vsizetype="MinimumExpanding">
@@ -481,6 +481,7 @@
  <resources>
   <include location="resource/resource.qrc"/>
   <include location="resource/resource.qrc"/>
+  <include location="resource/resource.qrc"/>
  </resources>
  <connections>
   <connection>
diff --git a/qtviewer_planetosm/qtaxviewer_planetosm.cpp b/qtviewer_planetosm/qtaxviewer_planetosm.cpp
index e9f360b72c4dd27777f023a54298a1d6d3a7b84a..97f522cbdb059690c9dfcd2e40a3127fa403e790 100644
--- a/qtviewer_planetosm/qtaxviewer_planetosm.cpp
+++ b/qtviewer_planetosm/qtaxviewer_planetosm.cpp
@@ -460,8 +460,26 @@ QString qtaxviewer_planetosm::osm_layer_call_function(QString layerName, QString
 		p_out = la->call_func(p_in);
 		strRes = map_to_string(p_out);
 	}
+	else if (layerName=="MAIN_MAP")
+	{
+		QMap<QString, QVariant> p_in;
+		p_in = string_to_map(args);
+		if (p_in["function"].toString().toUpper()=="ENABLELITEMODE")
+		{
+			if (p_in["mode"].toInt()==0)
+				this->enableLiteMode(false);
+			else
+				this->enableLiteMode(true);
+
+		}
+		else
+		{
+			strRes = QString("error=Layer name \"%1\" does not have this function.;").arg(layerName);
+		}
+
+	}
 	else
-		strRes = QString("error=Layer name \"%1\" does not exist.;").arg(layerName);
+		strRes = QString("error=Layer name \"%1\" does not exist.MAIN_MAP means the main map frame.;").arg(layerName);
 	return strRes;
 }
 
diff --git a/qtviewer_planetosm/qtwidget_planetosm.cpp b/qtviewer_planetosm/qtwidget_planetosm.cpp
index 99a57d9019a1278ba4d9c45d6f3442bb73c45940..8ebfae196116a002c055be9487f1d83870fbdc72 100644
--- a/qtviewer_planetosm/qtwidget_planetosm.cpp
+++ b/qtviewer_planetosm/qtwidget_planetosm.cpp
@@ -465,3 +465,8 @@ QString qtwidget_planetosm::osm_layer_call_function(QString layerName, QString a
 	return strRes;
 }
 
+void qtwidget_planetosm::enableLiteMode(bool bEnabled)
+{
+	osm_frame_widget * mp = qobject_cast<osm_frame_widget *>(m_map_widget);
+	mp->enableLiteMode(bEnabled);
+}
diff --git a/qtviewer_planetosm/qtwidget_planetosm.h b/qtviewer_planetosm/qtwidget_planetosm.h
index 9df1cd81fbe011a5479c0a9bfb71303c19619218..f320ca511b593d9bd4146bd9eff6188678b4fbf7 100644
--- a/qtviewer_planetosm/qtwidget_planetosm.h
+++ b/qtviewer_planetosm/qtwidget_planetosm.h
@@ -30,6 +30,7 @@ protected:
 public:
 	explicit qtwidget_planetosm(QWidget *parent = 0);
 	~qtwidget_planetosm();
+	void enableLiteMode(bool bEnabled);
 	//! slots below is designed for widget interfaces
 public:
 	QTVOSM::viewer_interface * viewer();