diff --git a/src/board/UBBoardPaletteManager.cpp b/src/board/UBBoardPaletteManager.cpp
index cc9fff7c..986a8356 100644
--- a/src/board/UBBoardPaletteManager.cpp
+++ b/src/board/UBBoardPaletteManager.cpp
@@ -1013,6 +1013,7 @@ void UBBoardPaletteManager::startDownloads()
     if(!mDownloadInProgress)
     {
         mDownloadInProgress = true;
+        mpDownloadWidget->setVisibleState(true);
         mRightPalette->addTab(mpDownloadWidget);
     }
 }
@@ -1022,6 +1023,7 @@ void UBBoardPaletteManager::stopDownloads()
     if(mDownloadInProgress)
     {
         mDownloadInProgress = false;
+        mpDownloadWidget->setVisibleState(false);
         mRightPalette->removeTab(mpDownloadWidget->name());
     }
 }
diff --git a/src/gui/UBCachePropertiesWidget.cpp b/src/gui/UBCachePropertiesWidget.cpp
index 46f9f798..751c5d15 100644
--- a/src/gui/UBCachePropertiesWidget.cpp
+++ b/src/gui/UBCachePropertiesWidget.cpp
@@ -38,6 +38,7 @@ UBCachePropertiesWidget::UBCachePropertiesWidget(QWidget *parent, const char *na
     setStyleSheet(UBApplication::globalStyleSheet());
 
     mName = "CachePropWidget";
+    mVisibleState = false;
     mIconToLeft = QPixmap(":images/cache_open.png");
     mIconToRight = QPixmap(":images/cache_close.png");
     setContentsMargins(10, 10, 10, 10);
diff --git a/src/gui/UBDockDownloadWidget.cpp b/src/gui/UBDockDownloadWidget.cpp
index 5f373b9d..01b5d0ac 100644
--- a/src/gui/UBDockDownloadWidget.cpp
+++ b/src/gui/UBDockDownloadWidget.cpp
@@ -20,6 +20,7 @@ UBDockDownloadWidget::UBDockDownloadWidget(QWidget *parent, const char *name):UB
   , mpDLWidget(NULL)
 {
     mName = "DownloadWidget";
+    mVisibleState = false;
 
     setAttribute(Qt::WA_StyledBackground, true);
     setStyleSheet(UBApplication::globalStyleSheet());
diff --git a/src/gui/UBDockPalette.cpp b/src/gui/UBDockPalette.cpp
index b7b7a6f6..d7c75106 100644
--- a/src/gui/UBDockPalette.cpp
+++ b/src/gui/UBDockPalette.cpp
@@ -540,35 +540,35 @@ int UBDockPalette::customMargin()
  * \brief Add the given tab widget
  * @param widget as the given widget
  */
-void UBDockPalette::addTab(UBDockPaletteWidget *widget)
-{
-    if(!mTabWidgets.contains(widget))
-    {
-        widget->setVisible(true);
-        mTabWidgets.append(widget);
-        mpStackWidget->addWidget(widget);
-        mpStackWidget->setCurrentWidget(widget);
-        update();
-    }
+void UBDockPalette::addTab(UBDockPaletteWidget *widget)
+{
+    if(!mTabWidgets.contains(widget) && widget->visibleState())
+    {
+        widget->setVisible(true);
+        mTabWidgets.append(widget);
+        mpStackWidget->addWidget(widget);
+        mpStackWidget->setCurrentWidget(widget);
+        update();
+    }
 }
 /**
  * \brief Remove the given tab
  * @param widgetName as the tab widget name
  */
-void UBDockPalette::removeTab(const QString &widgetName)
-{
-    for(int i = 0; i < mTabWidgets.size(); i++)
-    {
-        UBDockPaletteWidget* pCrntWidget = mTabWidgets.at(i);
-        if(NULL != pCrntWidget && (pCrntWidget->name() == widgetName))
-        {
-            mpStackWidget->removeWidget(pCrntWidget);
-            mTabWidgets.remove(i);
-            pCrntWidget->hide();
-            update();
-            break;
-        }
-    }
+void UBDockPalette::removeTab(const QString &widgetName)
+{
+    for(int i = 0; i < mTabWidgets.size(); i++)
+    {
+        UBDockPaletteWidget* pCrntWidget = mTabWidgets.at(i);
+        if(NULL != pCrntWidget && (pCrntWidget->name() == widgetName))
+        {
+            mpStackWidget->removeWidget(pCrntWidget);
+            mTabWidgets.remove(i);
+            pCrntWidget->hide();
+            update();
+            break;
+        }
+    }
 }
 
 /**
@@ -600,6 +600,7 @@ void UBDockPalette::onShowTabWidget(const QString &widgetName)
         UBDockPaletteWidget* pCrntWidget = mRegisteredWidgets.at(i);
         if(NULL != pCrntWidget && (pCrntWidget->name() == widgetName))
         {
+            pCrntWidget->setVisibleState(true);
             addTab(pCrntWidget);
             break;
         }
@@ -612,6 +613,13 @@ void UBDockPalette::onShowTabWidget(const QString &widgetName)
  */
 void UBDockPalette::onHideTabWidget(const QString &widgetName)
 {
+    for(int i = 0; i < mRegisteredWidgets.size(); i++){
+        UBDockPaletteWidget* pCrntWidget = mRegisteredWidgets.at(i);
+        if(NULL != pCrntWidget && (pCrntWidget->name() == widgetName)){
+            pCrntWidget->setVisibleState(false);
+            break;
+        }
+    }
     removeTab(widgetName);
 }
 
diff --git a/src/gui/UBDockPaletteWidget.h b/src/gui/UBDockPaletteWidget.h
index 5c37cfff..fdf50a87 100644
--- a/src/gui/UBDockPaletteWidget.h
+++ b/src/gui/UBDockPaletteWidget.h
@@ -27,8 +27,9 @@ public:
 
     void registerMode(eUBDockPaletteWidgetMode mode);
 
-    QVector<eUBDockPaletteWidgetMode> GetRegisteredModes() { return mRegisteredModes; };
-
+    QVector<eUBDockPaletteWidgetMode> GetRegisteredModes() { return mRegisteredModes; }
+    bool visibleState(){return mVisibleState;}
+    void setVisibleState(bool state){mVisibleState = state;}
 
 signals:
     void hideTab(const QString& widgetName);
@@ -46,6 +47,7 @@ protected:
     /* The current widget available mode list */
     QVector<eUBDockPaletteWidgetMode> mRegisteredModes;
 
+    bool mVisibleState;
 };
 
 #endif // UBDOCKPALETTEWIDGET_H
diff --git a/src/gui/UBLibWidget.cpp b/src/gui/UBLibWidget.cpp
index 8e23613d..459de6c5 100644
--- a/src/gui/UBLibWidget.cpp
+++ b/src/gui/UBLibWidget.cpp
@@ -35,6 +35,7 @@ UBLibWidget::UBLibWidget(QWidget *parent, const char *name):UBDockPaletteWidget(
 {
     setObjectName(name);
     mName = "LibWidget";
+    mVisibleState = true;
 
     setAttribute(Qt::WA_StyledBackground, true);
     setStyleSheet(UBApplication::globalStyleSheet());
diff --git a/src/gui/UBPageNavigationWidget.cpp b/src/gui/UBPageNavigationWidget.cpp
index b0a4e444..77c378c2 100644
--- a/src/gui/UBPageNavigationWidget.cpp
+++ b/src/gui/UBPageNavigationWidget.cpp
@@ -31,6 +31,7 @@ UBPageNavigationWidget::UBPageNavigationWidget(QWidget *parent, const char *name
 {
     setObjectName(name);
     mName = "PageNavigator";
+    mVisibleState = true;
     setAttribute(Qt::WA_StyledBackground, true);
     setStyleSheet(UBApplication::globalStyleSheet());
 
diff --git a/src/gui/UBTeacherBarWidget.cpp b/src/gui/UBTeacherBarWidget.cpp
index 77b2ef58..bca8ffc5 100644
--- a/src/gui/UBTeacherBarWidget.cpp
+++ b/src/gui/UBTeacherBarWidget.cpp
@@ -36,6 +36,7 @@ UBTeacherBarWidget::UBTeacherBarWidget(QWidget *parent, const char *name):UBDock
 {
     setObjectName(name);
     mName = "TeacherBarWidget";
+    mVisibleState = true;
 
     setAttribute(Qt::WA_StyledBackground, true);
     setStyleSheet(UBApplication::globalStyleSheet());