<Window x:Class="WpfApp28.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp28"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Button Width="100" Height="50" Content="ボタン" Click="Button_Click"/>
    </Grid>
</Window>

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApp28
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (sender is Button bt)
            {
                // TransformGroupを作成(大きさを3倍にして、右に10pixcelずらす)
                var tfg = new TransformGroup();
                tfg.Children.Add(new ScaleTransform(3, 3));
                tfg.Children.Add(new TranslateTransform(10, 0));

                // ボタンのRenderTransformにセット
                bt.RenderTransform = tfg;
            }
        }
    }
}