In my wpf project, I have a datagrid with rows with rounded corners, this is how my xaml looks:
<DataGrid x:Name="Tasks" SelectedCellsChanged="Tasks_SelectedCellsChanged" CanUserDeleteRows="True" IsReadOnly="False" AutoGenerateColumns="False" HorizontalAlignment="Left" Height="413" Margin="20,50,0,0" VerticalAlignment="Top" Width="1100" Background="Transparent" HorizontalGridLinesBrush="Transparent" VerticalGridLinesBrush="Transparent" RowBackground="#202020">
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridRow}">
<Border x:Name="DGR_Border" BorderBrush="Transparent"
BorderThickness="0"
Background="{TemplateBinding Background}"
SnapsToDevicePixels="True"
CornerRadius="20">
<SelectiveScrollingGrid>
<SelectiveScrollingGrid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</SelectiveScrollingGrid.ColumnDefinitions>
<SelectiveScrollingGrid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</SelectiveScrollingGrid.RowDefinitions>
<DataGridCellsPresenter Grid.Column="1" ItemsPanel="{TemplateBinding ItemsPanel}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<DataGridDetailsPresenter Grid.Column="1" Grid.Row="1" SelectiveScrollingGrid.SelectiveScrollingOrientation="{Binding AreRowDetailsFrozen, ConverterParameter={x:Static SelectiveScrollingOrientation.Vertical}, Converter={x:Static DataGrid.RowDetailsScrollingConverter}, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" Visibility="{TemplateBinding DetailsVisibility}"/>
<DataGridRowHeader Grid.RowSpan="2" SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical" Visibility="{Binding HeadersVisibility, ConverterParameter={x:Static DataGridHeadersVisibility.Row}, Converter={x:Static DataGrid.HeadersVisibilityConverter}, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>
</SelectiveScrollingGrid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DataGrid.RowStyle>
<DataGrid.Columns>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="..." Binding="{Binding ..., Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTemplateColumn Header="Actions">
<DataGridTemplateColumn.HeaderStyle>
<Style BasedOn="{StaticResource MaterialDesignDataGridColumnHeader}" TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="HorizontalContentAlignment" Value="Right" />
</Style>
</DataGridTemplateColumn.HeaderStyle>
<DataGridTemplateColumn.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="Background" Value="#262626" />
<Setter Property="Height" Value="30"/>
</Style>
</DataGridTemplateColumn.CellStyle>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Click="Start_Task_Click" Background="Transparent" BorderBrush="Transparent">
<materialDesign:PackIcon Kind="Play" Foreground="White"/>
</Button>
<Button Margin="5,0,0,0" Click="Stop_Button_Click" Background="Transparent" BorderBrush="Transparent">
<materialDesign:PackIcon Kind="Stop" Foreground="White"/>
</Button>
<Button Margin="5,0,0,0" Click="Edit_Task" Background="Transparent" BorderBrush="Transparent">
<materialDesign:PackIcon Kind="Pencil" Foreground="White"/>
</Button>
<Button Margin="5,0,0,0" Click="Delete_Button_Click" Background="Transparent" BorderBrush="Transparent">
<materialDesign:PackIcon Kind="Delete" Foreground="White"/>
</Button>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
How would I be able to add a margin between rows without messing up the rounded corners? Sorry if this is a stupid question, but I am very terrible at styling anything in xaml. I have tried following the answers from this question, but they are mostly to add padding to the columns and not the rows.
SOLUTION
Put a Margin in the DRG_Border
