(Advanced?) Layout question

[Super Lloyd]

I have a FrameworkElement (subclass) in my app which is a host for custom Visuals (my app is a sort of drawing program). Now I just put the first UIElement in the visual container. A UserControl which host a bunch of Controls, including a TextBox. Now when the Text change and the text box resize and go outside the containing UserControl, it is clipped and does not show anymore. I tried to set Clip to false on the UserControl, didn't help (in fact it was already false). Now in my UIElement I can be aware of the need to resize, thanks to

protected virtual void OnChildDesiredSizeChanged(UIElement child);

But I need to know that in my visual container. At the moment it looks like it should only really be able to host & resize UIElement which implement some sort of INotifyResize interface, which I could inform thanks to this OnChildDesiredSizeChanged() method. I wonder if there is already a way I can know that, with just any UIElement, not just the one made specifically to be hosted by that container. EDIT / REMARK 5 minutes later... I think I might had answered my own question! :omg: :rolleyes: :-D I could just override OnChildDesiredSizeChanged() in the visual container.... I think there might be some issues, because some ContainerVisual are involved in the Visual hierarchy... let's see... EDIT2 So I tried that and it is really strange

    protected override void OnChildDesiredSizeChanged(UIElement child)
    {
        base.OnChildDesiredSizeChanged(child);
		child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
		child.Arrange(new Rect(BoundedVisual.GetLocation(child), child.DesiredSize));
    }

This method is called only once and the child didn't resize... EDIT3 Ha, I see, this didn't work, it this was another child (the one which display the scollbar). got nothing for the text... EDIT / FOUND a solution I am using this UIElement event to do my reArrange(), it seems to be working :)

    public event EventHandler LayoutUpdated;

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