Stop blowing up on a doubleclick in CodeMetrics UI

Author: Vogel612

RetailCoder.VBE/UI/CodeMetrics/CodeMetricsControl.xaml

@@ -3,7 +3,6 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-             xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
              xmlns:codeMetrics="clr-namespace:Rubberduck.Navigation.CodeMetrics"
              xmlns:controls="clr-namespace:Rubberduck.UI.Controls"
              xmlns:converters="clr-namespace:Rubberduck.UI.Converters"
@@ -155,7 +154,7 @@
         </Border>
         <controls:EmptyUIRefresh Grid.Row="2" />
 
-        <DataGrid Grid.Row="2" ItemsSource="{Binding ModuleMetrics}" AutoGenerateColumns="False">
+        <DataGrid Grid.Row="2" ItemsSource="{Binding ModuleMetrics}" AutoGenerateColumns="False" IsReadOnly="True">
             <DataGrid.Columns>
                 <DataGridTextColumn Binding="{Binding Path=ModuleName}" Header="Declaration" Width="*"/>
                 <DataGridTextColumn Binding="{Binding Path=Result.Lines}" Header="Lines" Width="Auto"/>
@@ -164,7 +163,7 @@
             </DataGrid.Columns>
             <DataGrid.RowDetailsTemplate>
                 <DataTemplate>
-                    <DataGrid ItemsSource="{Binding Path=MemberResults}" AutoGenerateColumns="False">
+                    <DataGrid ItemsSource="{Binding Path=MemberResults}" AutoGenerateColumns="False" IsReadOnly="True">
                         <DataGrid.Columns>
                             <DataGridTextColumn Header="Declaration" Binding="{Binding Path=Key.IdentifierName}" Width="*"/>
                             <DataGridTextColumn Header="Lines" Binding="{Binding Path=Value.Lines}"  Width="Auto"/>