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copied!<p>When you place more than one control in the same place,one will end up on top,and the other will end up underneath.Usually this is the result of a minor mistake,such as incorrectly using the anchoring and docking features to creare resizable form.In some cases,however,you might want to overlap control for a specific effect.</p> <p>When control overlap,it's the z-index that determines which control ends up on top.Essentially,every control existy in its own distinct numbered layer.A control that has the z-index layer 1 will appear above a control in z-index layer 2 if they overlap.Usually,the z-index of a group of controls is determined by the order in which you add the controls,so that the last control you add is always in the topmost layer (with a z-index of 0).</p> <p>However, you can change these options.</p> <p>To determine or set the z-index of a control , you can use the <code>GetChildIndex()</code> and <code>SetChildIndex()</code> methods of the Controls Collection.Here's an example that moves a control to the third layer in the z-index.</p> <pre><code>Controls.SetChildIndex(ctrl, 2); </code></pre> <p>Usually, you won't need this kind of find-grained control.Instead,you'll just want to drop a control to the back of the z-index (the bottom-most layer) or bring it to the top.You can accomplish this feature at design time by right clicking on a control and choosing Bring to Fron or Send to Back.You can also perform the same task programmatically using the <code>Control.BringToFront()</code> or <code>Control.SendToBack()</code> methods.</p> <pre><code>ctrl.BringToFront(); // This is equivalent to Controls.SetChildIndex(ctrl,0); </code></pre>

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