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copied!<p>In order to better understand what's happening <em>under the hood</em>, I recommend you to install <a href="http://ilspy.net/" rel="nofollow">ILSpy</a>. Open <code>System.Windows.Forms</code> from the GAC and take a look at the <code>Control</code> class.</p> <p>The exhibit B <strong>will work</strong> because the <code>Controls</code> property of the <code>System.Windows.Form.Control</code> class contains all the controls, disregarding their modifiers:</p> <pre><code>public Control.ControlCollection Controls { get { Control.ControlCollection controlCollection = (Control.ControlCollection)this.Properties.GetObject(Control.PropControlsCollection); if (controlCollection == null) { controlCollection = this.CreateControlsInstance(); this.Properties.SetObject(Control.PropControlsCollection, controlCollection); } return controlCollection; } } </code></pre> <p>Where <code>CreateControlsInstance</code> is:</p> <pre><code>protected virtual Control.ControlCollection CreateControlsInstance() { return new Control.ControlCollection(this); } </code></pre> <p>So the <code>System.Windows.Forms.Control.ControlCollection.Find</code> method, which is <code>public</code>, searches the specidfied control name over the <strong>whole</strong> control collection:</p> <pre><code>public Control[] Find(string key, bool searchAllChildren) { if (string.IsNullOrEmpty(key)) { throw new ArgumentNullException("key", SR.GetString("FindKeyMayNotBeEmptyOrNull")); } ArrayList arrayList = this.FindInternal(key, searchAllChildren, this, new ArrayList()); Control[] array = new Control[arrayList.Count]; arrayList.CopyTo(array, 0); return array; } </code></pre>

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