Добавлены поля для вывода общего размера и освобождаемого. Без заполнения.

OneCleaner/MainWindow.xaml

@@ -41,24 +41,36 @@
     <Window.TaskbarItemInfo>
         <TaskbarItemInfo/>
     </Window.TaskbarItemInfo>
-    <Grid>
+    <Grid Name="MainGrid">
         <Grid.RowDefinitions>
             <RowDefinition Height="32"/>
             <RowDefinition Height="*"/>
-            <RowDefinition Height="35"/>
+            <RowDefinition Height="40"/>
         </Grid.RowDefinitions>
         <TextBlock TextWrapping="Wrap" Text="Получение списка установленных версий..." HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="18" Foreground="#FF9C9C9C" Grid.Row="1"/>
         <ListView x:Name="List" ItemTemplate="{StaticResource myItem}" PreviewKeyDown="List_PreviewKeyDown" Grid.Row="1"/>
-        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Grid.Row="2" Margin="10,7,5,5">
+        <Grid Grid.Row="2">
-            <Button x:Name="ButtonCancel" Content="Отменить" Visibility="Collapsed" Click="ButtonCancel_Click" Margin="0,0,3,0"/>
+            <Grid.ColumnDefinitions>
-            <Button x:Name="ButtonUninstall" Content="Выполнить удаление"  Click="ButtonUninstall_Click" Margin="3,0,0,0"/>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="150"/>
+            </Grid.ColumnDefinitions>
+            <StackPanel Grid.Column="0" Orientation="Horizontal" HorizontalAlignment="Left" Margin="0,6">
+                <Label Content="Всего:" Margin="0"/>
+                <Label Content="{Binding TotalSize}" Margin="0"/>
+                <Label Content="К удалению:" Margin="0"/>
+                <Label Content="{Binding FreeSize}"  Margin="0"/>
             </StackPanel>
+            <StackPanel Grid.Column="1" Orientation="Horizontal" Margin="0,6,6,6" HorizontalAlignment="Right">
+                <Button x:Name="ButtonCancel" Content="Отменить" Visibility="Collapsed" Click="ButtonCancel_Click" Margin="0"/>
+                <Button x:Name="ButtonUninstall" Content="Выполнить удаление"  Click="ButtonUninstall_Click" Margin="6,0,0,0"/>
+            </StackPanel>
+        </Grid>
         <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" Grid.Row="0" Grid.Column="0">
-            <Button Margin="3 3" Background="{x:Null}" BorderThickness="0.4" Click="Button_Click" Width="25" Height="25">
+            <Button Margin="3 3" Background="{x:Null}" BorderThickness="0.4" Click="ButtonSelectAll_Click" Width="25" Height="25">
                 <Image Source="checked.png" Stretch="None" />
             </Button>
 
-            <Button Margin="3 3" Background="{x:Null}" BorderThickness="0.4" Click="Button_Click_2" Width="25" Height="25">
+            <Button Margin="3 3" Background="{x:Null}" BorderThickness="0.4" Click="ButtonUnselectAll_Click" Width="25" Height="25">
                 <Image Source="unchecked.png" Stretch="None" />
             </Button>
         </StackPanel>

OneCleaner/MainWindow.xaml.cs

@@ -4,9 +4,7 @@ using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
-using System.Windows.Documents;
 using System.Windows.Input;
-using System.Windows.Media;
 using System.Windows.Shell;
 
 namespace OneCleaner
@@ -16,6 +14,9 @@ namespace OneCleaner
     /// </summary>
     public partial class MainWindow : Window
     {
+        public string TotalSize { get; set; }
+        public string FreeSize { get; set; }
+
         private InstalledVersionUICollection _installedVersions = new InstalledVersionUICollection();
         private bool _cancelFlag = false;
 
@@ -24,6 +25,12 @@ namespace OneCleaner
             InitializeComponent();
             List.ItemsSource = _installedVersions;
 
+            MainGrid.DataContext = this;
+
+            TotalSize = "0 MB";
+            FreeSize = "0 MB";
+
+
 #if DEBUG
             this.Title = this.Title + " (DEBUG)";
 #endif
@@ -65,26 +72,6 @@ namespace OneCleaner
             };
         }
 
-        private void Button_Click_1(object sender, RoutedEventArgs e)
-        {
-            var item = FindVisualParent<ListItem>(sender as Button);
-        }
-
-        public static T FindVisualParent<T>(DependencyObject childElement) where T : DependencyObject
-        {
-            DependencyObject parent = VisualTreeHelper.GetParent(childElement);
-            T parentAsT = parent as T;
-            if (parent == null)
-            {
-                return null;
-            }
-            else if (parentAsT != null)
-            {
-                return parentAsT;
-            }
-            return FindVisualParent<T>(parent);
-        }
-
         private void ButtonCancel_Click(object sender, RoutedEventArgs e)
         {
             _cancelFlag = true;
@@ -111,7 +98,7 @@ namespace OneCleaner
             }
         }
 
-        private void Button_Click(object sender, RoutedEventArgs e)
+        private void ButtonSelectAll_Click(object sender, RoutedEventArgs e)
         {
             foreach (var item in _installedVersions)
             {
@@ -119,7 +106,7 @@ namespace OneCleaner
             }
         }
 
-        private void Button_Click_2(object sender, RoutedEventArgs e)
+        private void ButtonUnselectAll_Click(object sender, RoutedEventArgs e)
         {
             foreach (var item in _installedVersions)
             {
@@ -163,7 +150,6 @@ namespace OneCleaner
             this.TaskbarItemInfo.ProgressState = TaskbarItemProgressState.None;
 
             SetWindowStateIdle();
-
         }
     }
 }