Fixing popup background

Author: batzen

Fluent.Ribbon/Themes/Controls/ResizeableContentControl.xaml

@@ -14,7 +14,7 @@
         <Border x:Name="PART_DropDownBorder"
                 HorizontalAlignment="Stretch"
                 VerticalAlignment="Stretch"
-                Background="{DynamicResource Fluent.Ribbon.Brushes.DropDown..Background}"
+                Background="{DynamicResource Fluent.Ribbon.Brushes.DropDown.Background}"
                 BorderBrush="{DynamicResource Fluent.Ribbon.Brushes.DropDown.Border}"
                 BorderThickness="1"
                 SnapsToDevicePixels="True">
@@ -34,7 +34,7 @@
                         Height="11"
                         HorizontalAlignment="Stretch"
                         VerticalAlignment="Top"
-                        Background="{DynamicResource Fluent.Ribbon.Brushes.DropDown.Resize..Background}"
+                        Background="{DynamicResource Fluent.Ribbon.Brushes.DropDown.Resize.Background}"
                         BorderBrush="{DynamicResource Fluent.Ribbon.Brushes.DropDown.Resize.Border}"
                         BorderThickness="0 1 0 0">
                     <Grid>