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copied!<p>When you retrieve the <code>MovieClip</code> from your <code>Array</code>, you need to cast it as a <code>DisplayObject</code> before attempting to remove it: </p> <pre><code> if (thumbnails.length !== 0){ // Determine if any movieclips have already been created on stage and delete them for(var ctr:int = 0; ctr < thumbnails.length;ctr++ ){ removeChild(DisplayObject(thumbnails[ctr])); } } </code></pre> <p>Alternatively, you could consider using a <code>Vector</code> (a type-safe version of an <code>Array</code>) with the base-type set as <code>DisplayObject</code>: </p> <pre><code>var thumbnails:Vector.<DisplayObject> = new Vector.<DisplayObject>(); thumbnails.push(new MovieClip()); this.addChild(thumbnails[0]); this.removeChild(thumbnails[0]); </code></pre> <p>For further reading, have a look at the Adobe documentation on <a href="http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f87.html" rel="nofollow">type conversion</a> and <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/Vector.html" rel="nofollow"><code>Vectors</code></a>. </p> <p><strong>Update:</strong></p> <p>Instead of adding an instance of <code>Thumbnail</code> to your <code>Array</code> the following line is actually adding a further <code>Array</code> containing a single element to your thumbnails <code>Array</code> (in effect you are creating a multi-dimensional <code>Array</code>):</p> <pre><code>// You're assigning an array literal with a single element // to this element of the the thumbnails array thumbnails[i] = [thumb]; </code></pre> <p>Try either of the following instead: </p> <pre><code> // What you meant thumbnails[i] = thumb; // Better thumbnails.push(thumb); </code></pre>

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