private void Fly_Opened(object sender, object e)
{
Flyout fly = (Flyout)sender;
EditLayerControl control = (EditLayerControl)fly.Content;
control.Width = ActualWidth - 2;
}
public void ShowLayerPropertyFlyout()
{
EditLayerControl editControl = new EditLayerControl();
editControl.Initialize(Layer);
Flyout fly = new Flyout();
fly.Content = editControl;
fly.Opened += Fly_Opened;
fly.Placement = FlyoutPlacementMode.Left;
fly.ShowAt(this);
}