Hide the Border for the generated address unless one was generated.

Simplify the UI by always showing the "generate address" button.
Click again to generate a new address, replacing the old.

Improve the xaml so it doesn't look like it got generated by 15
different automated tools.

Make the address manually selectable so it can be copied, since the
label under the address is lying and it is not automatically copied to
clipboard yet.

Fixes btcsuite#13.

Paymetheus/Request.xaml

@@ -145,18 +145,10 @@
         </Style>
     </Page.Resources>
 
-    <Grid x:Name="LayoutRoot" Margin="40 60 40 0">
-        <Grid.RowDefinitions>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="27"/>
-            <RowDefinition Height="40"/>
-            <RowDefinition Height="381.293"/>
-        </Grid.RowDefinitions>
-        <TextBlock Grid.Row="0" HorizontalAlignment="Left" Text="Request payment" Foreground="#FF5A6E81" FontSize="20"/>
-        <TextBlock Grid.Row="1" HorizontalAlignment="Left" Text="Each time you request a payment, create a new address to protect your privacy" Foreground="#FF0C1E3E" FontSize="11"/>
-        <Grid Grid.Row="2" Width="300">
+    <StackPanel Margin="40 60 40 0">
+        <TextBlock Margin="0 0 0 20" HorizontalAlignment="Left" Text="Request payment" Foreground="#FF5A6E81" FontSize="20"/>
+        <TextBlock Margin="0 0 0 40" HorizontalAlignment="Left" Text="Each time you request a payment, create a new address to protect your privacy" Foreground="#FF0C1E3E" FontSize="11"/>
+        <Grid Width="300" Margin="0 0 0 30">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="Auto"/>
                 <ColumnDefinition/>
@@ -175,16 +167,17 @@
                 </ComboBox.Background>
             </ComboBox>
         </Grid>
-        <Grid Margin="91,31,60.17,0" Grid.Row="4" Grid.RowSpan="2" VerticalAlignment="Top">
-            <Rectangle x:Name="RectangleGenerate" Visibility="{Binding HideWhenNoAddressToDisplay}" Fill="White" Height="68" Stroke="#FFD3D9DF" RadiusX="5" RadiusY="5"/>
-            <Button x:Name="ButtonGenerate" Visibility="{Binding HideIfAddressToDisplay}" Command="{Binding GenerateAddressCommand}"  Content="Generate a single-use address" Style="{DynamicResource HyperLinkButton}" FontSize="19.333" Foreground="#FF2970FF" Height="36.274" Width="299.774" />
-            <TextBlock x:Name="LblCode" Visibility="{Binding HideWhenNoAddressToDisplay}" Height="66" Margin="0,12,-0.17,0" TextWrapping="Wrap" Text="{Binding GeneratedAddress}" VerticalAlignment="Top" Foreground="#FF132F4B" FontSize="28" TextAlignment="Center"/>
-        </Grid>
-        <TextBlock Height="24" Margin="0,76.059,0,0" Grid.Row="5" TextWrapping="Wrap" VerticalAlignment="Top" Foreground="#FF586D80" TextAlignment="Center">
-                <Run Text="Single use address generated for account"/>
-                <Run FontWeight="Bold" Text="{Binding Source={StaticResource ViewModelLocator}, Path=SynchronizerViewModel.SelectedAccount.AccountProperties.AccountName, Mode=OneWay, FallbackValue=Account Name}"/>
-                <Run Text="+ copied to clipboard"/>
-        </TextBlock>
-        <Button Name="GenerateAnotherBtn"  Visibility="{Binding HideWhenNoAddressToDisplay}" Content="GENERATE ANOTHER" Command="{Binding GenerateAddressCommand}" Height="35.5" Margin="0,128,0,0" Style="{DynamicResource ButtonBlue}" Foreground="#FF132F4B" Grid.Row="5" Width="162.697" VerticalAlignment="Top"/>
-    </Grid>
+        <Button Margin="0 0 0 30" HorizontalAlignment="Center" Content="GENERATE ADDRESS" Command="{Binding GenerateAddressCommand}" Style="{DynamicResource ButtonBlue}"/>
+        <Border Visibility="{Binding GeneratedAddress, Mode=OneWay, Converter={StaticResource NullToHiddenConverter}}" Background="White" BorderBrush="#FFD3D9DF" BorderThickness="2" CornerRadius="5" Padding="5">
+            <StackPanel>
+                <!-- TextBox is used rather than a TextBlock so the user can still manually select the address -->
+                <TextBox TextAlignment="Center" Text="{Binding GeneratedAddress, Mode=OneWay, FallbackValue=123Address}" IsReadOnly="True" Foreground="#FF132F4B" FontSize="28" BorderThickness="0"/>
+                <TextBlock Grid.Row="5" TextWrapping="Wrap" Foreground="#FF586D80" TextAlignment="Center">
+                    <Run Text="Single use address generated for account"/>
+                    <Run FontWeight="Bold" Text="{Binding Source={StaticResource ViewModelLocator}, Path=SynchronizerViewModel.SelectedAccount.AccountProperties.AccountName, Mode=OneWay, FallbackValue=Account Name}"/>
+                    <Run Text="+ copied to clipboard"/>
+                </TextBlock>
+            </StackPanel>
+        </Border>
+    </StackPanel>
 </Page>