Wpf - change the color of the selected row in XAML

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XAML

WPF

I am new to XAML therefore please pardon me for this basic question. Basically i am trying to change the color of the selected row in DataGrid. Currently when the row is selected the color is by default light blue but i dont understand where the color is set from. I want to change the selected color and also the text color of the selected row. Below is my code.

<DataGrid Name="TransferCallDataGrid"
             Margin="0 10 0 0"
             IsReadOnly="True"
             ItemsSource="{Binding Agents}"
             SelectedItem="{Binding SelectedAgent}"
             AutoGenerateColumns="False"
             HeadersVisibility="Column"
             HorizontalAlignment="Stretch"
             HorizontalGridLinesBrush="LightGray"
             VerticalGridLinesBrush="Transparent"
             HorizontalScrollBarVisibility="Disabled"
             CanUserAddRows="False"
             CanUserSortColumns="False"
             CanUserReorderColumns="False"
             BorderBrush="Transparent"
             SelectionUnit="FullRow"

             RowStyle="{DynamicResource DataGridRowStyle1}" ColumnHeaderStyle="{DynamicResource DataGridColumnHeaderStyle1}">
               <DataGrid.Columns>
                   <DataGridTemplateColumn Header="ID" Width=".7*">
                       <DataGridTemplateColumn.CellTemplate>
                           <DataTemplate>
                               <Grid>
                                   <Grid.ColumnDefinitions>
                                       <ColumnDefinition Width="2"/>
                                       <ColumnDefinition/>
                                   </Grid.ColumnDefinitions>
                                   <Rectangle Grid.Column="0" Fill="{Binding Path=AgentState, Converter={StaticResource AgentStateConverterResource}}" Width="3" Margin="0" HorizontalAlignment="Left"/>
                                   <TextBlock Grid.Column="1" TextAlignment="Center" Text="{Binding Id}" Style="{DynamicResource GridTextColumnStyle}"/>
                               </Grid>
                           </DataTemplate>
                       </DataGridTemplateColumn.CellTemplate>
                   </DataGridTemplateColumn>

                   <DataGridTemplateColumn Header="First Name" Width="*">
                       <DataGridTemplateColumn.CellTemplate>
                           <DataTemplate>
                               <TextBlock TextAlignment="Center" Text="{Binding FirstName}" Style="{DynamicResource GridTextColumnStyle}"/>
                           </DataTemplate>
                       </DataGridTemplateColumn.CellTemplate>
                   </DataGridTemplateColumn>

                   <DataGridTemplateColumn Header="Last Name" Width="*">
                       <DataGridTemplateColumn.CellTemplate>
                           <DataTemplate>
                               <TextBlock TextAlignment="Center" Text="{Binding LastName}" Style="{DynamicResource GridTextColumnStyle}"/>
                           </DataTemplate>
                       </DataGridTemplateColumn.CellTemplate>
                   </DataGridTemplateColumn>

                   <DataGridTemplateColumn Header="State" Width="1.1*">
                       <DataGridTemplateColumn.CellTemplate>
                           <DataTemplate>
                               <TextBlock TextAlignment="Center" Text="{Binding Path=AgentState, Converter={StaticResource AgentStateTextConverterResource}}" Style="{DynamicResource GridTextColumnStyle}" Foreground="{Binding Path=AgentState, Converter={StaticResource AgentStateConverterResource}}"/>
                           </DataTemplate>
                       </DataGridTemplateColumn.CellTemplate>
                   </DataGridTemplateColumn>
               </DataGrid.Columns>
           </DataGrid>

And following is the styling of the row i believe

<Style x:Key="DataGridRowStyle1" TargetType="{x:Type DataGridRow}">
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
        <Setter Property="ValidationErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <TextBlock Foreground="Red" Margin="2,0,0,0" Text="!" VerticalAlignment="Center"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type DataGridRow}">
                    <Border x:Name="DGR_Border" BorderBrush="Transparent" BorderThickness="0" Background="White" SnapsToDevicePixels="True">
                        <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.Triggers>
            <Trigger Property="IsNewItem" Value="True">
                <Setter Property="Margin" Value="{Binding NewItemMargin, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>
            </Trigger>

        </Style.Triggers>

    </Style>

What I have tried:

Have tried googling it and could not find much help there