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    <p>that's because in your code you raise an event on a new UserControl2. for your specific example the code of the UserControl1.button1_Click event should be like this:</p> <pre><code>private void button1_Click(object sender, RoutedEventArgs e) { if (this.Parent != null &amp;&amp; this.Parent is StackPanel) { StackPanel parentControl = this.Parent as StackPanel; foreach (UIElement child in parentControl.Children) { if (child is UserControl2) ((UserControl2)child).CallDelegate(); } } } </code></pre> <p><strong>EDIT:</strong> kay so it seems you want to get all the usercontrol2 within the window1 to be resized. then what you need is to make a recursive function to get the topmost parent, e.g (modded from hardcodet.net/2008/02/find-wpf-parent)</p> <pre><code>DependencyObject GetHighestParent(DependencyObject child) { ContentElement contentElement = child as ContentElement; if (contentElement != null) { DependencyObject parent = ContentOperations.GetParent(contentElement); if (parent != null) return parent; FrameworkContentElement fce = contentElement as FrameworkContentElement; return fce != null ? fce.Parent : null; } FrameworkElement frameworkElement = child as FrameworkElement; if (frameworkElement != null) { DependencyObject parent = frameworkElement.Parent; if (parent != null) { return GetHighestParent(parent); } else { return child; } } DependencyObject visualParent = VisualTreeHelper.GetParent(child); if (visualParent != null) return GetHighestParent(visualParent); else return child; } </code></pre> <p>then you might want to create a method to walkdown all the children like this:</p> <pre><code>void CallDelegateInAllControl2(DependencyObject parent) { int childCount = VisualTreeHelper.GetChildrenCount(parent); for (int i = 0; i &lt; childCount; i++) { DependencyObject child = VisualTreeHelper.GetChild(parent, i); if (child is UserControl2) { ((UserControl2)child).CallDelegate(); } else { CallDelegateInAllControl2(child); } } } </code></pre> <p>and then you call it within button1_click event</p> <pre><code>private void button1_Click(object sender, RoutedEventArgs e) { DependencyObject parent = GetHighestParent(this); if(parent!=null) CallDelegateInAllControl2(parent); } </code></pre> <p>note: a walk to get parent and child might be tricky and risky i think and i believe it's a long process so you might just want to re-layout your window1 so it has a StackPanel/Grid with a usercontrol1 element and all usercontrol2 elements within it so you can use the first code i post.</p>
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    1. CO@dnr3 Thanks, great
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    2. COno worries sir.
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    3. CO@dnr3: When i mention this.Parent as StackPanel; it takes all the contorls in that usercontrol as childrens, but am using more that one usercontrol in my main form. how can i assign all the usercontrols in my mainWindow to the stackpanel children??????
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