PropertyChangedCallback - first call?

Question

OnIconScaleChange called every time when I change the property IconScale but never called on startup. (with default value = 50.0 ) Tell me how to modify the code to OnIconScaleChange invoked the first time on create a UserControl?

private static void OnIconScaleChange(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    MyControl c = (MyControl)d;

    if (c != null)
    {
        double v = (double)e.NewValue;
        ScaleTransform scaleTransform = new ScaleTransform(v, v);
        c.RenderTransform = scaleTransform;
    }
}

public double IconScale
{
    get { return (double)GetValue(IconScaleProperty); }
    set { SetValue(IconScaleProperty, value); }
}

public static readonly DependencyProperty IconScaleProperty =
 DependencyProperty.Register("IconScale", typeof(double), typeof(MyControl), new FrameworkPropertyMetadata(50.0, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnIconScaleChange)));

Answer 1

Initialize RenderTransform in the constructor of MyControl:

public MyControl()
{
    InitializeComponent();
    RenderTransform = new ScaleTransform(IconScale, IconScale);
}