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    copied!<p>You can call your custom code AFTER calling base.ArrangeOverride() in your window's ArrangeOverride implementation:</p> <pre><code> protected override Size ArrangeOverride(Size arrangeBounds) { Size temp = base.ArrangeOverride(arrangeBounds); // custom code goes here! return temp; } </code></pre> <p>(I tested just now and it works: the custom code is executed after the ArrangeOverride of any child control in the window)</p> <p>EDIT: Follows a tested and working example:</p> <p>In window1.xaml.cs:</p> <pre><code>[...] protected override Size ArrangeOverride(Size arrangeBounds) { Trace.TraceInformation("Window1.ArrangeOverride START"); Size temp = base.ArrangeOverride(arrangeBounds); Trace.TraceInformation("Window1.ArrangeOverride END"); return temp; } [...] </code></pre> <p>In myUserControl.xaml.cs:</p> <pre><code>[...] protected override Size ArrangeOverride(Size arrangeBounds) { Trace.TraceInformation("{0}.ArrangeOverride START", Tag); Size s = base.ArrangeOverride(arrangeBounds); Trace.TraceInformation("{0}.ArrangeOverride END", Tag); return s; } [...] </code></pre> <p>In window1.xaml:</p> <pre><code>[...] &lt;local:myUserControl Tag="FirstLevelControl"&gt; &lt;StackPanel&gt; &lt;local:myUserControl Tag="SecondLevelControl_1"&gt; &lt;TextBlock&gt;First&lt;/TextBlock&gt; &lt;/local:myUserControl&gt; &lt;local:myUserControl Tag="SecondLevelControl_2"&gt; &lt;TextBlock&gt;Second&lt;/TextBlock&gt; &lt;/local:myUserControl&gt; &lt;/StackPanel&gt; &lt;/local:myUserControl&gt; [...] </code></pre> <p>And, finally, the output after the execution:</p> <pre><code>[...] Test.vshost.exe Information: 0 : Window1.ArrangeOverride START Test.vshost.exe Information: 0 : FirstLevelControl.ArrangeOverride START Test.vshost.exe Information: 0 : SecondLevelControl_1.ArrangeOverride START Test.vshost.exe Information: 0 : SecondLevelControl_1.ArrangeOverride END Test.vshost.exe Information: 0 : SecondLevelControl_2.ArrangeOverride START Test.vshost.exe Information: 0 : SecondLevelControl_2.ArrangeOverride END Test.vshost.exe Information: 0 : FirstLevelControl.ArrangeOverride END Test.vshost.exe Information: 0 : Window1.ArrangeOverride END [...] </code></pre> <p>This demonstrate that the line of code between <code>temp = base.ArrangeOverride</code> and <code>return temp</code> is always executed AFTER all the code in all nested user controls' ArrangeOverride method. I've not tried to trace the execution of Arrange of built-in controls, but I suppose they have the same behaviour.</p>
 

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