diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index 2f44259..d5a83f5 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -13,7 +13,51 @@
   <property name="windowTitle">
    <string>MainWindow</string>
   </property>
-  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <widget class="QSplitter" name="splitter">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+        <horstretch>2</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="orientation">
+       <enum>Qt::Horizontal</enum>
+      </property>
+      <widget class="QTreeView" name="treeView">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+      <widget class="QWidget" name="widget" native="true">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+         <horstretch>2</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+     </widget>
+    </item>
+   </layout>
+  </widget>
   <widget class="QMenuBar" name="menubar">
    <property name="geometry">
     <rect>
@@ -121,7 +165,8 @@
   </action>
   <action name="actionGoUp">
    <property name="icon">
-    <iconset theme="go-up"/>
+    <iconset theme="go-up">
+     <normaloff>.</normaloff>.</iconset>
    </property>
    <property name="text">
     <string>Go &amp;Up</string>
@@ -135,7 +180,8 @@
   </action>
   <action name="actionReload">
    <property name="icon">
-    <iconset theme="reload"/>
+    <iconset theme="reload">
+     <normaloff>.</normaloff>.</iconset>
    </property>
    <property name="text">
     <string>&amp;Reload</string>
@@ -173,7 +219,8 @@
   </action>
   <action name="actionOptions">
    <property name="icon">
-    <iconset theme="settings"/>
+    <iconset theme="settings">
+     <normaloff>.</normaloff>.</iconset>
    </property>
    <property name="text">
     <string>&amp;Options</string>
@@ -184,7 +231,8 @@
   </action>
   <action name="actionExit">
    <property name="icon">
-    <iconset theme="exit"/>
+    <iconset theme="exit">
+     <normaloff>.</normaloff>.</iconset>
    </property>
    <property name="text">
     <string>&amp;Exit</string>