public class AwesomeButton : Button
{
    public TextBlock txtCaption;
    public TextBlock txtIcon;
    
    public AwesomeButton ()
    {
        #region create Button content manually
        txtCaption = new TextBlock {
            VerticalAlignment = VerticalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center,
        };
        txtIcon = new TextBlock {
            Text = "\uF005",// star
            FontFamily = new FontFamily("Font Awesome 5 Free Regular"),
            FontSize = 16,
            Padding = new Thickness(5, 2, 5, 2),
            VerticalAlignment = VerticalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center, 
        };
        txtIcon.SetValue(TextOptions.TextFormattingModeProperty, TextFormattingMode.Ideal);
        
        var dock = new DockPanel();
        DockPanel.SetDock(txtIcon, IconPos);
        dock.Children.Add(txtIcon);
        dock.Children.Add(txtCaption);
        
        var grid = new Grid();// needed only to be sure 'dock' is shrinked to all avl space
        grid.Children.Add(dock);
        this.Content = grid;
        #endregion
    }
    
    /// <summary>String of characters from 'Awesome' font</summary>
    public string IconText
    {
        get => txtIcon.Text;
        set => txtIcon.Text = value;
    }

    Dock _iconPos = Dock.Left;
    public Dock IconPos
    {
        get => _iconPos;
        set {
            _iconPos = value;
            DockPanel.SetDock(txtIcon, _iconPos);
        }
    }
    
    public Brush IconColor
    {
        get => txtIcon.Foreground;
        set => txtIcon.Foreground = value;
    }
    
    public double IconSize
    {
        get => txtIcon.FontSize;
        set => txtIcon.FontSize = value;
    }
    
    /// <summary>Text appearing on the button</summary>
    public string Text
    {
        get => txtCaption.Text;
        set => txtCaption.Text = value;
    }
    
    public new bool IsEnabled
    {
        get => base.IsEnabled;
        set {
            base.IsEnabled = value;
            txtIcon.Opacity = (value ? 1.0 : 0.5);// icon is not affected by IsEnabled - make disabled look manually
        }
    }
}