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    <p><strong>Update</strong><br> Optimized <code>RecalcMatrix</code> so the UI is only rebuilt when needed. It doesn't touch the UI unless necessary so it should be much faster.</p> <p><strong>Update Again</strong><br> Fixed problem when using <code>Margin</code></p> <p>Is think what you're looking at is basically a <code>WrapPanel</code> with Horizontal Orientation where every element in it is a 1 Column <code>Grid</code>. Each element in a Column then has a corresponding <code>RowDefinition</code> where the <code>Height</code> Property matches an attached property (<code>"WrapHeight"</code>) set on its Child. This Panel would have to be in a <code>Grid</code> itself, with <code>Height="*"</code> and <code>Width="Auto"</code> because the Children should be positioned by the available <code>Height</code> and not care about the available <code>Width</code>.</p> <p>I made an implementation of this which I called a <code>WrapGridPanel</code>. You can use it like this </p> <pre><code>&lt;local:WrapGridPanel&gt; &lt;Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto"&gt;I'm auto-sized.&lt;/Button&gt; &lt;Button MinHeight="90" local:WrapGridPanel.WrapHeight="*"&gt;I'm star-sized.&lt;/Button&gt; &lt;Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto"&gt;I'm auto-sized.&lt;/Button&gt; &lt;Button MinHeight="90" local:WrapGridPanel.WrapHeight="*"&gt;I'm star-sized, too!&lt;/Button&gt; &lt;Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto"&gt;I'm auto-sized.&lt;/Button&gt; &lt;Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto"&gt;I'm auto-sized.&lt;/Button&gt; &lt;/local:WrapGridPanel&gt; </code></pre> <p><img src="https://i.stack.imgur.com/mD1X6.png" alt="alt text"></p> <p><strong>WrapGridPanel.cs</strong></p> <pre><code>[ContentProperty("WrapChildren")] public class WrapGridPanel : Grid { private WrapPanel m_wrapPanel = new WrapPanel(); public WrapGridPanel() { ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1.0, GridUnitType.Auto) } ); RowDefinitions.Add(new RowDefinition { Height = new GridLength(1.0, GridUnitType.Star) } ); Children.Add(m_wrapPanel); WrapChildren = new ObservableCollection&lt;FrameworkElement&gt;(); WrapChildren.CollectionChanged += WrapChildren_CollectionChanged; DependencyPropertyDescriptor actualHeightDescriptor = DependencyPropertyDescriptor.FromProperty(WrapGridPanel.ActualHeightProperty, typeof(WrapGridPanel)); if (actualHeightDescriptor != null) { actualHeightDescriptor.AddValueChanged(this, ActualHeightChanged); } } public static void SetWrapHeight(DependencyObject element, GridLength value) { element.SetValue(WrapHeightProperty, value); } public static GridLength GetWrapHeight(DependencyObject element) { return (GridLength)element.GetValue(WrapHeightProperty); } public ObservableCollection&lt;FrameworkElement&gt; WrapChildren { get { return (ObservableCollection&lt;FrameworkElement&gt;)base.GetValue(WrapChildrenProperty); } set { base.SetValue(WrapChildrenProperty, value); } } void ActualHeightChanged(object sender, EventArgs e) { RecalcMatrix(); } void WrapChildren_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { RecalcMatrix(); } List&lt;List&lt;FrameworkElement&gt;&gt; m_elementList = null; private bool SetupMatrix() { m_elementList = new List&lt;List&lt;FrameworkElement&gt;&gt;(); double minHeightSum = 0; m_elementList.Add(new List&lt;FrameworkElement&gt;()); int column = 0; if (WrapChildren.Count &gt; 0) { foreach (FrameworkElement child in WrapChildren) { double tempMinHeight = 0.0; if (WrapGridPanel.GetWrapHeight(child).GridUnitType != GridUnitType.Star) { tempMinHeight = Math.Max(child.ActualHeight, child.MinHeight) + child.Margin.Top + child.Margin.Bottom; } else { tempMinHeight = child.MinHeight + child.Margin.Top + child.Margin.Bottom; } minHeightSum += tempMinHeight; if (minHeightSum &gt; ActualHeight) { minHeightSum = tempMinHeight; m_elementList.Add(new List&lt;FrameworkElement&gt;()); column++; } m_elementList[column].Add(child); } } if (m_elementList.Count != m_wrapPanel.Children.Count) { return true; } for (int i = 0; i &lt; m_elementList.Count; i++) { List&lt;FrameworkElement&gt; columnList = m_elementList[i]; Grid wrapGrid = m_wrapPanel.Children[i] as Grid; if (columnList.Count != wrapGrid.Children.Count) { return true; } } return false; } private void RecalcMatrix() { if (ActualHeight == 0 || SetupMatrix() == false) { return; } Binding heightBinding = new Binding("ActualHeight"); heightBinding.Source = this; while (m_elementList.Count &gt; m_wrapPanel.Children.Count) { Grid wrapGrid = new Grid(); wrapGrid.SetBinding(Grid.HeightProperty, heightBinding); m_wrapPanel.Children.Add(wrapGrid); } while (m_elementList.Count &lt; m_wrapPanel.Children.Count) { Grid wrapGrid = m_wrapPanel.Children[m_wrapPanel.Children.Count - 1] as Grid; wrapGrid.Children.Clear(); m_wrapPanel.Children.Remove(wrapGrid); } for (int i = 0; i &lt; m_elementList.Count; i++) { List&lt;FrameworkElement&gt; columnList = m_elementList[i]; Grid wrapGrid = m_wrapPanel.Children[i] as Grid; wrapGrid.RowDefinitions.Clear(); for (int j = 0; j &lt; columnList.Count; j++) { FrameworkElement child = columnList[j]; GridLength wrapHeight = WrapGridPanel.GetWrapHeight(child); Grid.SetRow(child, j); Grid parentGrid = child.Parent as Grid; if (parentGrid != wrapGrid) { if (parentGrid != null) { parentGrid.Children.Remove(child); } wrapGrid.Children.Add(child); } RowDefinition rowDefinition = new RowDefinition(); rowDefinition.Height = new GridLength(Math.Max(1, child.MinHeight), wrapHeight.GridUnitType); wrapGrid.RowDefinitions.Add(rowDefinition); } } } public static readonly DependencyProperty WrapHeightProperty = DependencyProperty.RegisterAttached("WrapHeight", typeof(GridLength), typeof(WrapGridPanel), new FrameworkPropertyMetadata(new GridLength(1.0, GridUnitType.Auto))); public static readonly DependencyProperty WrapChildrenProperty = DependencyProperty.Register("WrapChildren", typeof(ObservableCollection&lt;FrameworkElement&gt;), typeof(WrapGridPanel), new UIPropertyMetadata(null)); } </code></pre> <p><strong>Update</strong><br> Fixed more than one star-sized column problem.<br> New sample app here: <a href="http://www.mediafire.com/?28z4rbd4pp790t2" rel="nofollow noreferrer">http://www.mediafire.com/?28z4rbd4pp790t2</a></p> <p><strong>Update</strong><br> A picture that tries to explain what <code>WrapGridPanel</code> does</p> <p><img src="https://i.stack.imgur.com/UERSF.png" alt="alt text"></p>
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    1. COVery cool! I downloaded your test code and tried it out. I only found one bug: it appears that star-sized elements with a MinHeight higher than the smallest MinHeight are ignored. That is to say, if there are a few star-sized objects with a MinHeight of 90, then a star-sized object with a MinHeight of 180 will be treated as if it had a MinHeight of 90, and will be overlapped. Here's a screenshot showing this. I've labeled each star sized element with its MinHeight: http://i.imgur.com/H9GqU.png
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    2. CO@Aphex: Didn't notice that one! I'll look into it
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    3. CO@Aphex: The problem was that every star-sized row got * as Height, it should be 90*, 180* etc. I updated my example. I've upload a new sample-app as well
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