更新

WPFDark/Controls/BiaUniformGridStyle.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:controls="clr-namespace:WPFDark.Controls"
+                    xmlns:wpf="clr-namespace:WPFDark">
+    <Style x:Key="BiaUniformGridGroupingStyle" TargetType="{x:Type controls:BiaUniformGrid}">
+        <Style.Resources>
+            <Style TargetType="{x:Type controls:BiaButton}">
+                <Setter Property="CornerRadius" Value="0" />
+            </Style>
+            <Style TargetType="{x:Type controls:BiaToggleButton}">
+                <Setter Property="CornerRadius" Value="0" />
+            </Style>
+            <Style TargetType="{x:Type controls:BiaIconButton}">
+                <Setter Property="CornerRadius" Value="0" />
+            </Style>
+            <Style TargetType="{x:Type controls:BiaIconToggleButton}">
+                <Setter Property="CornerRadius" Value="0" />
+            </Style>
+        </Style.Resources>
+
+        <Setter Property="CornerRadius" Value="{x:Static wpf:Constants.GroupCornerRadius}" />
+    </Style>
+    
+    <Style x:Key="BiaUniformGridSmallGroupingStyle" TargetType="{x:Type controls:BiaUniformGrid}" BasedOn="{StaticResource BiaUniformGridGroupingStyle}">
+        <Setter Property="CornerRadius" Value="{x:Static wpf:Constants.BasicCornerRadius}" />
+    </Style>
+</ResourceDictionary>