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copied!<p>Okay, long time ago but here is the solution I found that time back...</p> <p><strong>The Collection:</strong> Note the hack comments.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Media; using System.Collections.ObjectModel; using WPF.Controls.Primitives; namespace WPF.Controls.Core { public class PrimitiveCollection : ObservableCollection<Primitive> { protected PrimitiveContainerVisual _owner; public PrimitiveCollection(PrimitiveContainerVisual owner) : base() { if (owner == null) throw new ArgumentNullException("owner"); _owner = owner; } protected override void ClearItems() { foreach (var item in this) { item.IsDirtyChanged -= new IsDirtyChangedHandler(item_IsDirtyChanged); _owner.InternalRemoveVisualChild(item); } base.ClearItems(); } protected override void InsertItem(int index, Primitive item) { if (item != null && item.Parent != null) throw new ArgumentNullException("Visual has parent"); item.IsDirtyChanged += new IsDirtyChangedHandler(item_IsDirtyChanged); _owner.InternalAddVisualChild(item); base.InsertItem(index, item); } protected override void RemoveItem(int index) { Primitive item = this[index]; item.IsDirtyChanged -= new IsDirtyChangedHandler(item_IsDirtyChanged); _owner.InternalRemoveVisualChild(item); base.RemoveItem(index); } protected override void OnPropertyChanged(System.ComponentModel.PropertyChangedEventArgs e) { base.OnPropertyChanged(e); } void item_IsDirtyChanged(object sender, PrimitiveChangedEventArgs e) { if(e.IsDirty) _owner.RequestRedraw(); } } } </code></pre> <p><strong>And the Control which you can use in XAML</strong></p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Media; using WPF.Controls.Primitives; using System.Windows; using System.Reflection; namespace WPF.Controls.Core { public class PrimitiveContainerVisual : Visual { private PrimitiveCollection _primitives; private PropertyInfo _contentBoundsPropInfo; private PropertyInfo _descendantBoundsPropInfo; public PrimitiveCollection Children { get { return _primitives; } set { _primitives = value; } } public Rect ContentBounds { // HACK access internal property of Visual get { return (Rect)_contentBoundsPropInfo.GetValue(this, null); } } public Rect DescendantBounds { // HACK access internal property of Visual get { return (Rect)_descendantBoundsPropInfo.GetValue(this, null); } } public PrimitiveContainerVisual() { _primitives = new PrimitiveCollection(this); Type thisType = this.GetType(); BindingFlags flags = BindingFlags.NonPublic | BindingFlags.Instance; _contentBoundsPropInfo = thisType.GetProperty("VisualContentBounds", flags); _descendantBoundsPropInfo = thisType.GetProperty("VisualDescendantBounds", flags); } internal void InternalAddVisualChild(Primitive prim) { this.AddVisualChild(prim); } internal void InternalRemoveVisualChild(Primitive prim) { this.RemoveVisualChild(prim); } public bool RequestRedraw() { UIElement uiParent = VisualParent as UIElement; if (uiParent != null) { uiParent.InvalidateVisual(); return true; } else return false; } } } </code></pre>

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