Fix to DigitalForms dock not refreshing

prs.desktop/MainWindow.xaml

@@ -988,7 +988,8 @@
                                 CanDockAsTabbedDocument="False"
                                 AutoHideWidth="500"
                                 FloatingWidth="500"
-                                AutoHideMinWidth="400">
+                                AutoHideMinWidth="400"
+                                IsActiveChanged="DockPanel_OnIsActiveChanged">
                                 <Border BorderThickness="0.75" BorderBrush="Gray" Margin="0,4,0,0" Padding="4" Background="WhiteSmoke">
                                     <local:DigitalFormsDock x:Name="DigitalForms" />
                                 </Border>