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    <p>If you look at the <code>measure</code> method of <code>mx.controls.ComboBase</code>, you'll see that the the comboBox calculates it's <code>measuredMinWidth</code> as a sum of the width of the text and the width of the comboBox button.</p> <pre><code> // Text fields have 4 pixels of white space added to each side // by the player, so fudge this amount. // If we don't have any data, measure a single space char for defaults if (collection &amp;&amp; collection.length &gt; 0) { var prefSize:Object = calculatePreferredSizeFromData(collection.length); var bm:EdgeMetrics = borderMetrics; var textWidth:Number = prefSize.width + bm.left + bm.right + 8; var textHeight:Number = prefSize.height + bm.top + bm.bottom + UITextField.TEXT_HEIGHT_PADDING; measuredMinWidth = measuredWidth = textWidth + buttonWidth; measuredMinHeight = measuredHeight = Math.max(textHeight, buttonHeight); } </code></pre> <p>The <code>calculatePreferredSizeFromData</code> method mentioned by @defmeta (implemented in <code>mx.controls.ComboBox</code>) assumes that the data renderer is just a text field, and uses <code>flash.text.lineMetrics</code> to calculate the text width from label field in the <code>data</code> object. If you want to add an additional visual element to the item renderer and have the <code>ComboBox</code> take it's size into account when calculating it's own size, you will have to extend the <code>mx.controls.ComboBox</code> class and override the <code>calculatePreferredSizeFromData</code> method like so:</p> <pre><code> override protected function calculatePreferredSizeFromData(count:int):Object { var prefSize:Object = super.calculatePrefferedSizeFromData(count); var maxW:Number = 0; var maxH:Number = 0; var bookmark:CursorBookmark = iterator ? iterator.bookmark : null; var more:Boolean = iterator != null; for ( var i:int = 0 ; i &lt; count ; i++) { var data:Object; if (more) data = iterator ? iterator.current : null; else data = null; if(data) { var imgH:Number; var imgW:Number; //calculate the image height and width using the data object here maxH = Math.max(maxH, prefSize.height + imgH); maxW = Math.max(maxW, prefSize.width + imgW); } if(iterator) iterator.moveNext(); } if(iterator) iterator.seek(bookmark, 0); return {width: maxW, height: maxH}; } </code></pre> <p>If possible store the image dimensions in the data object and use those values as <code>imgH</code> and <code>imgW</code>, that will make sizing much easier.</p> <p>EDIT: </p> <p>If you are adding elements to the render besides an image, like a label, you will also have to calculate their size as well when you iterate through the data elements and take those dimensions into account when calculating <code>maxH</code> and <code>maxW</code>.</p>
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    1. POFlex: Custom Item Renderer For Combobox controls truncates text
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    1. USRyan Lynch
    1. USRyan Lynch
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