XAML-Map-Control/MapControl/Avalonia/Themes/Generic.axaml

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:map="clr-namespace:MapControl">

    <!-- Style replaced by TemplateProperty and ItemsPanelProperty default value overrides -->
    <!--
    <Style Selector="map|MapItemsControl">
        <Setter Property="Template">
            <ControlTemplate>
                <ItemsPresenter ItemsPanel="{TemplateBinding ItemsPanel}"/>
            </ControlTemplate>
        </Setter>
        <Setter Property="ItemsPanel">
            <Setter.Value>
                <ItemsPanelTemplate>
                    <map:MapPanel/>
                </ItemsPanelTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    -->

    <Style Selector="map|MapContentControl">
        <Setter Property="Background" Value="{Binding Background, RelativeSource={RelativeSource AncestorType=map:MapBase}}"/>
        <Setter Property="BorderBrush" Value="{Binding Foreground, RelativeSource={RelativeSource AncestorType=map:MapBase}}"/>
        <Setter Property="HorizontalAlignment" Value="Center"/>
        <Setter Property="VerticalAlignment" Value="Center"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="Template">
            <ControlTemplate>
                <ContentPresenter Content="{TemplateBinding Content}"
                                  ContentTemplate="{TemplateBinding ContentTemplate}"
                                  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                  VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                  Margin="{TemplateBinding Padding}"/>
            </ControlTemplate>
        </Setter>
    </Style>

    <Style Selector="map|Pushpin">
        <Setter Property="Background" Value="{Binding Background, RelativeSource={RelativeSource AncestorType=map:MapBase}}"/>
        <Setter Property="BorderBrush" Value="{Binding Foreground, RelativeSource={RelativeSource AncestorType=map:MapBase}}"/>
        <Setter Property="HorizontalAlignment" Value="Center"/>
        <Setter Property="VerticalAlignment" Value="Bottom"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="CornerRadius" Value="5"/>
        <Setter Property="Padding" Value="7,5"/>
        <Setter Property="Template">
            <ControlTemplate>
                <map:PushpinBorder
                    HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderWidth="{Binding BorderThickness.Left, RelativeSource={RelativeSource TemplatedParent}}"
                    CornerRadius="{TemplateBinding CornerRadius}"
                    Padding="{TemplateBinding Padding}">
                    <ContentPresenter
                        Content="{TemplateBinding Content}"
                        ContentTemplate="{TemplateBinding ContentTemplate}"
                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </map:PushpinBorder>
            </ControlTemplate>
        </Setter>
    </Style>
</Styles>