diff --git a/src/src.pro b/src/src.pro
index c8eac51b..22128bd3 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -96,7 +96,8 @@ SOURCES += main.cpp\
     vsnippetlist.cpp \
     vsnippet.cpp \
     dialog/veditsnippetdialog.cpp \
-    utils/vimnavigationforwidget.cpp
+    utils/vimnavigationforwidget.cpp \
+    vtoolbox.cpp
 
 HEADERS  += vmainwindow.h \
     vdirectorytree.h \
@@ -179,7 +180,8 @@ HEADERS  += vmainwindow.h \
     vsnippetlist.h \
     vsnippet.h \
     dialog/veditsnippetdialog.h \
-    utils/vimnavigationforwidget.h
+    utils/vimnavigationforwidget.h \
+    vtoolbox.h
 
 RESOURCES += \
     vnote.qrc \
diff --git a/src/vmainwindow.cpp b/src/vmainwindow.cpp
index b9aee1eb..b254ab7c 100644
--- a/src/vmainwindow.cpp
+++ b/src/vmainwindow.cpp
@@ -31,6 +31,7 @@
 #include "vattachmentlist.h"
 #include "vfilesessioninfo.h"
 #include "vsnippetlist.h"
+#include "vtoolbox.h"
 
 VMainWindow *g_mainWin;
 
@@ -1200,7 +1201,7 @@ void VMainWindow::initDockWindows()
     // Snippets.
     m_snippetList = new VSnippetList(this);
 
-    m_toolBox = new QToolBox(this);
+    m_toolBox = new VToolBox(this);
     m_toolBox->addItem(outline,
                        QIcon(":/resources/icons/outline.svg"),
                        tr("Outline"));
diff --git a/src/vmainwindow.h b/src/vmainwindow.h
index e1428282..7cb88878 100644
--- a/src/vmainwindow.h
+++ b/src/vmainwindow.h
@@ -23,7 +23,7 @@ class VNotebook;
 class QActionGroup;
 class VFileList;
 class VEditArea;
-class QToolBox;
+class VToolBox;
 class VOutline;
 class VNotebookSelector;
 class VAvatar;
@@ -299,7 +299,7 @@ private:
     QDockWidget *toolDock;
 
     // Tool box in the dock widget.
-    QToolBox *m_toolBox;
+    VToolBox *m_toolBox;
 
     VOutline *outline;
 
diff --git a/src/vtoolbox.cpp b/src/vtoolbox.cpp
new file mode 100644
index 00000000..6e424539
--- /dev/null
+++ b/src/vtoolbox.cpp
@@ -0,0 +1,96 @@
+#include "vtoolbox.h"
+
+#include <QPushButton>
+#include <QStackedLayout>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
+#include <QVariant>
+
+
+VToolBox::VToolBox(QWidget *p_parent)
+    : QWidget(p_parent),
+      m_currentIndex(-1)
+{
+    setupUI();
+}
+
+void VToolBox::setupUI()
+{
+    m_btnLayout = new QHBoxLayout();
+    m_btnLayout->addStretch();
+
+    m_widgetLayout = new QStackedLayout();
+
+    QVBoxLayout *mainLayout = new QVBoxLayout();
+    mainLayout->addLayout(m_btnLayout);
+    mainLayout->addLayout(m_widgetLayout);
+    mainLayout->setContentsMargins(0, 0, 0, 0);
+
+    setLayout(mainLayout);
+}
+
+int VToolBox::addItem(QWidget *p_widget, const QIcon &p_iconSet, const QString &p_text)
+{
+    int idx = m_items.size();
+
+    // New a button.
+    QPushButton *btn = new QPushButton(p_iconSet, "");
+    btn->setToolTip(p_text);
+    btn->setProperty("FlatBtn", true);
+    connect(btn, &QPushButton::clicked,
+            this, [this]() {
+                QObject *btn = sender();
+                for (int i = 0; i < m_items.size(); ++i) {
+                    if (m_items[i].m_btn == btn) {
+                        setCurrentIndex(i);
+                        break;
+                    }
+                }
+            });
+
+    m_btnLayout->insertWidget(idx, btn);
+
+    // Insert widget to layout.
+    m_widgetLayout->insertWidget(idx, p_widget);
+
+    m_items.push_back(ItemInfo(p_widget, p_text, btn));
+
+    if (m_items.size() == 1) {
+        setCurrentIndex(0);
+    }
+
+    return idx;
+}
+
+void VToolBox::setCurrentIndex(int p_idx)
+{
+    if (m_currentIndex == p_idx) {
+        return;
+    }
+
+    if (p_idx < 0 || p_idx >= m_items.size()) {
+        m_currentIndex = -1;
+    } else {
+        m_currentIndex = p_idx;
+    }
+
+    setCurrentButtonIndex(m_currentIndex);
+
+    m_widgetLayout->setCurrentIndex(m_currentIndex);
+}
+
+void VToolBox::setCurrentButtonIndex(int p_idx)
+{
+    // Remove the text of all button.
+    for (int i = 0; i < m_items.size(); ++i) {
+        QPushButton *btn = m_items[i].m_btn;
+        btn->setText("");
+        btn->clearFocus();
+    }
+
+    if (p_idx < 0 || p_idx >= m_items.size()) {
+        return;
+    }
+
+    m_items[p_idx].m_btn->setText(m_items[p_idx].m_text);
+}
diff --git a/src/vtoolbox.h b/src/vtoolbox.h
new file mode 100644
index 00000000..0b23a499
--- /dev/null
+++ b/src/vtoolbox.h
@@ -0,0 +1,57 @@
+#ifndef VTOOLBOX_H
+#define VTOOLBOX_H
+
+#include <QWidget>
+#include <QIcon>
+#include <QString>
+#include <QVector>
+
+class QPushButton;
+class QStackedLayout;
+class QBoxLayout;
+
+class VToolBox : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit VToolBox(QWidget *p_parent = nullptr);
+
+    int addItem(QWidget *p_widget, const QIcon &p_iconSet, const QString &p_text);
+
+    void setCurrentIndex(int p_idx);
+
+private:
+    struct ItemInfo
+    {
+        ItemInfo()
+            : m_widget(nullptr), m_btn(nullptr)
+        {
+        }
+
+        ItemInfo(QWidget *p_widget,
+                 const QString &p_text,
+                 QPushButton *p_btn)
+            : m_widget(p_widget), m_text(p_text), m_btn(p_btn)
+        {
+        }
+
+        QWidget *m_widget;
+        QString m_text;
+
+        QPushButton *m_btn;
+    };
+
+    void setupUI();
+
+    void setCurrentButtonIndex(int p_idx);
+
+    QBoxLayout *m_btnLayout;
+
+    QStackedLayout *m_widgetLayout;
+
+    int m_currentIndex;
+
+    QVector<ItemInfo> m_items;
+};
+
+#endif // VTOOLBOX_H