diff --git a/SepidarSidebar/MainWindow.xaml b/SepidarSidebar/MainWindow.xaml
index 5e72247..b610267 100644
--- a/SepidarSidebar/MainWindow.xaml
+++ b/SepidarSidebar/MainWindow.xaml
@@ -43,7 +43,12 @@
                             <Transform3DGroup>
                                 <RotateTransform3D>
                                     <RotateTransform3D.Rotation>
-                                        <AxisAngleRotation3D Axis="0,1,0" Angle="-17" />
+                                        <AxisAngleRotation3D Axis="0,1,0" Angle="{Binding Path=VerticalRotationDegree}" />
+                                    </RotateTransform3D.Rotation>
+                                </RotateTransform3D>
+                                <RotateTransform3D>
+                                    <RotateTransform3D.Rotation>
+                                        <AxisAngleRotation3D Axis="1,0,0" Angle="{Binding Path=HorizontalRotationDegree}" />
                                     </RotateTransform3D.Rotation>
                                 </RotateTransform3D>
                             </Transform3DGroup>
diff --git a/SepidarSidebar/MainWindow.xaml.cs b/SepidarSidebar/MainWindow.xaml.cs
index d7343ef..4869794 100644
--- a/SepidarSidebar/MainWindow.xaml.cs
+++ b/SepidarSidebar/MainWindow.xaml.cs
@@ -20,9 +20,13 @@ namespace SG.SepidarSidebar
     /// </summary>
     public partial class MainWindow : Window
     {
+        private MainWindowViewModel _viewModel;
         public MainWindow()
         {
             InitializeComponent();
+
+            _viewModel = new MainWindowViewModel();
+            this.DataContext = _viewModel;
         }
 
         protected override void OnMouseDown(MouseButtonEventArgs e)
@@ -32,5 +36,56 @@ protected override void OnMouseDown(MouseButtonEventArgs e)
             if (e.LeftButton == MouseButtonState.Pressed && e.RightButton == MouseButtonState.Released)
                 this.DragMove();
         }
+
+        protected override void OnKeyDown(KeyEventArgs e)
+        {
+            base.OnKeyDown(e);
+
+            if (e.Key == Key.D0)
+                ResetTransforms();
+            else if (e.Key == Key.OemPlus)
+            {
+                double w = this.Width * 1.5;
+                double sw = SystemParameters.PrimaryScreenWidth, sh = SystemParameters.PrimaryScreenHeight;
+                if (w > sw || w > sh)
+                    w = Math.Min(sw, sh);
+                this.Width = this.Height = w;
+            }
+            else if (e.Key == Key.OemMinus)
+            {
+                if (this.Width > 20)
+                {
+                    this.Width = this.Height = this.Width / 1.5;
+                }
+            }
+            else if (e.Key == Key.Right)
+            {
+                if (_viewModel.VerticalRotationDegree < 50)
+                    _viewModel.VerticalRotationDegree += 5;
+            }
+            else if (e.Key == Key.Left)
+            {
+                if (_viewModel.VerticalRotationDegree > -50)
+                    _viewModel.VerticalRotationDegree -= 5;
+            }
+            else if (e.Key == Key.Down)
+            {
+                if (_viewModel.HorizontalRotationDegree < 50)
+                    _viewModel.HorizontalRotationDegree += 5;
+            }
+            else if (e.Key == Key.Up)
+            {
+                if (_viewModel.HorizontalRotationDegree > -50)
+                    _viewModel.HorizontalRotationDegree -= 5;
+            }
+        }
+
+        public void ResetTransforms()
+        {
+            _viewModel.HorizontalRotationDegree = 0;
+            _viewModel.VerticalRotationDegree = -17;
+            Width = 250;
+            Height = 250;
+        }
     }
 }
diff --git a/SepidarSidebar/MainWindowViewModel.cs b/SepidarSidebar/MainWindowViewModel.cs
new file mode 100644
index 0000000..d0d84b2
--- /dev/null
+++ b/SepidarSidebar/MainWindowViewModel.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SG.SepidarSidebar
+{
+    public class MainWindowViewModel : ViewModelBase
+    {
+        private double _verticalRotationDegree = -17;
+        private double _horizontalRotationDegree = 0;
+
+        public double VerticalRotationDegree
+        {
+            get { return _verticalRotationDegree; }
+            set
+            {
+                if (_verticalRotationDegree != value)
+                {
+                    _verticalRotationDegree = value;
+                    OnPropertyChanged("VerticalRotationDegree");
+                }
+            }
+        }
+
+        public double HorizontalRotationDegree
+        {
+            get { return _horizontalRotationDegree; }
+            set
+            {
+                if (_horizontalRotationDegree != value)
+                {
+                    _horizontalRotationDegree = value;
+                    OnPropertyChanged("HorizontalRotationDegree");
+                }
+            }
+        }
+
+    }
+}
diff --git a/SepidarSidebar/SepidarSidebar.csproj b/SepidarSidebar/SepidarSidebar.csproj
index dfc4587..f3af600 100644
--- a/SepidarSidebar/SepidarSidebar.csproj
+++ b/SepidarSidebar/SepidarSidebar.csproj
@@ -54,6 +54,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="MainWindowViewModel.cs" />
     <Compile Include="ViewModelBase.cs" />
     <Page Include="ClockControl.xaml">
       <SubType>Designer</SubType>