Try out a new disabled style

Author: donokuda

src/GitHub.VisualStudio/Styles/Buttons.xaml

@@ -178,7 +178,10 @@
                         </Trigger>
 
                         <Trigger Property="IsEnabled" Value="False">
-                            <Setter Property="Opacity" Value="0.6" />
+                            <Setter Property="BorderBrush" Value="{DynamicResource GitHubPrimaryButtonBorderDisabledBrush}" />
+                            <Setter Property="Foreground" Value="{DynamicResource GitHubPrimaryButtonForegroundDisabledBrush}" />
+                            <Setter Property="Background" Value="{DynamicResource GitHubPrimaryButtonBackgroundDisabledBrush}" />
+                            <Setter Property="FontWeight" Value="Normal" />
                         </Trigger>
                     </ControlTemplate.Triggers>
                 </ControlTemplate>

src/GitHub.VisualStudio/Styles/ThemeBlue.xaml

@@ -32,7 +32,9 @@
   <SolidColorBrush x:Key="GitHubButtonBorderPressedBrush" Color="#FFBFBFBF" />
 
   <SolidColorBrush x:Key="GitHubPrimaryButtonBackgroundBrush" Color="#FF7ED321" />
-  <SolidColorBrush x:Key="GitHubPrimaryButtonBackgroundDisabledBrush" Color="#FF7ED321" Opacity="0.3" />
+  <SolidColorBrush x:Key="GitHubPrimaryButtonBackgroundDisabledBrush" Color="#FFFAFAFA" />
+  <SolidColorBrush x:Key="GitHubPrimaryButtonForegroundDisabledBrush" Color="#FF9B9B9B" />
+  <SolidColorBrush x:Key="GitHubPrimaryButtonBorderDisabledBrush" Color="#FFD4D4D4" />
   <SolidColorBrush x:Key="GitHubPrimaryButtonBackgroundMouseOverBrush" Color="#FF90D96F" />
   <SolidColorBrush x:Key="GitHubPrimaryButtonBackgroundPressedBrush" Color="#FF7FBF62" />
   <SolidColorBrush x:Key="GitHubPrimaryButtonForegroundBrush" Color="#FFFFFFFF" />

src/GitHub.VisualStudio/UI/Views/PullRequestCreationView.xaml

@@ -298,11 +298,13 @@
                                 <ColumnDefinition Width="Auto" />
                             </Grid.ColumnDefinitions>
 
+                            <!--
                             <Button Grid.Column="0"
                                     HorizontalAlignment="Right"
                                     Content="Cancel"
                                     Style="{StaticResource GitHubVsButton}"
                                     Command="{Binding Cancel}"/>
+                                    -->
                             <Button HorizontalAlignment="Right" Margin="6,0,0,0" Content="Create pull request" Grid.Column="1" Style="{StaticResource GitHubVsPrimaryActionButton}" />
                         </Grid>
                     </StackPanel>