MyMessageBox.xaml

<flyctrllib:WindowBigClose x:Class="FLY.ControlLibrary.MyMessageBox"
        xmlns:flyctrllib="clr-namespace:FLY.ControlLibrary"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        
        mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
                 
        SizeToContent="WidthAndHeight" WindowStartupLocation="CenterOwner">
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/FLY.ControlLibrary;component/Themes/Dictionary_MyStyle.xaml"/>
                <!--<ResourceDictionary Source="pack://application:,,,/ThickTcpUiInWindow;component/Culture/StringResource.zh-CN.xaml"/>-->
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>

    <Grid TextBlock.FontSize="24" TextBlock.FontStyle="Normal" >
        <StackPanel Orientation="Vertical" Margin="5" MinWidth="400">
            <Border Height="40"/>
            <TextBlock x:Name="textblock_message" Text="message" FontSize="40" Margin="10" MinHeight="100"/>
            <Button Style="{StaticResource ButtonStyle_empty}" HorizontalAlignment="Right" BorderThickness="0" VerticalAlignment="Bottom" Click="button_ok_Click" Margin="5" Background="White">
                <Path Data="{StaticResource Geometry_check-circle}" Fill="{StaticResource Color_theme_activity}" Stretch="Fill" Height="80" Width="80"  />
            </Button>
        </StackPanel>
    </Grid>

</flyctrllib:WindowBigClose>