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PO
 

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    <p>I tried to simplify your code a bit:</p> <pre><code>public class CustomPanel:Panel { protected override Size MeasureOverride(Size availableSize) { foreach (UIElement child in Children) child.Measure(new Size(double.PositiveInfinity,double.PositiveInfinity)); return new Size(0,0); } protected override Size ArrangeOverride(Size finalSize) { double remainingSpace = Math.Max(0.0,finalSize.Height - Children.Cast&lt;UIElement&gt;().Sum(c =&gt; c.DesiredSize.Height)); var extraSpace = remainingSpace / Children.Count; double offset = 0.0; foreach (UIElement child in Children) { double height = child.DesiredSize.Height + extraSpace; child.Arrange(new Rect(0, offset, finalSize.Width, height)); offset += height; } return finalSize; } } </code></pre> <p>A few notes:</p> <ul> <li>You shouldn't return available size in MeasureOverride - it could be positive infinity which will cause an exception. And since you basically don't care what size it is, just return new Size(0,0).</li> <li>As for your problem with the height of the children - I'm thinking it has to do with the actual children - are they limited in size somehow via Style or properties in regards to HorizontalAlignment?</li> </ul> <p>EDIT: version 2.0:</p> <pre><code> public class CustomPanel : Panel { protected override Size MeasureOverride(Size availableSize) { foreach (UIElement child in Children) child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity)); return new Size(0, 0); } protected override Size ArrangeOverride(Size finalSize) { double optimumHeight = finalSize.Height / Children.Count; var smallElements = Children.Cast&lt;UIElement&gt;().Where(c =&gt; c.DesiredSize.Height &lt; optimumHeight); double leftOverHeight = smallElements.Sum(c =&gt; optimumHeight - c.DesiredSize.Height); var extraSpaceForBigElements = leftOverHeight / (Children.Count - smallElements.Count()); double offset = 0.0; foreach (UIElement child in Children) { double height = child.DesiredSize.Height &lt; optimumHeight ? child.DesiredSize.Height : optimumHeight + extraSpaceForBigElements; child.Arrange(new Rect(0, offset, finalSize.Width, height)); offset += height; } return finalSize; } } </code></pre>
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    1. POA custom auto-sizing WPF Panel class
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    1. USGoblin
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    1. COOh wait - I think I missed your intentions of the panel... How do you determine which elements get the left-over space? Right now you code makes them all a little higher than they desire to be.
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      1. USGoblin
    2. COGoblin, your code only takes into account one case scenario, which is that all of the items fit naturally into the given space and have space leftover. This is only a fringe case in the intended use of the panel, which expects the total height of all elements to be larger than the height of the panel, but also expects some children to be smaller than 1/nth of the total space, and splits this "empty" space (that would occur in equally-sized rows) up among taller children.
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      1. USdevios1
    3. CO+1 for helping out.
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