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copied!<p>I would start by adding the combobox dataproviders (a list of the values they contain) to the <code>fx:declarations</code> tag:</p> <pre><code><fx:Declarations> <s:ArrayList id="height_data"> <fx:int>600</fx:int> <fx:int>700</fx:int> <fx:int>800</fx:int> <fx:int>900</fx:int> <fx:int>1000</fx:int> <fx:int>1100</fx:int> <fx:int>1200</fx:int> <fx:int>1300</fx:int> <fx:int>1400</fx:int> <fx:int>1500</fx:int> <fx:int>1600</fx:int> <fx:int>1700</fx:int> <fx:int>1800</fx:int> <fx:int>1900</fx:int> <fx:int>2000</fx:int> </s:ArrayList>  </fx:Declarations> </code></pre> <p>Then add two comboboxes, as well as an area for output to the form (here stacked in a <code>VGroup</code>, but you can arrange them however you want):</p> <pre><code><s:VGroup> <s:ComboBox id="shape_height" dataProvider="{height_data}" change="calculate_volume()"></s:ComboBox> <s:ComboBox id="shape_diameter" dataProvider="{diameter_data}" change="calculate_volume()"></s:ComboBox> <s:TextArea id="output"></s:TextArea> </s:VGroup> </code></pre> <p>And then create a function which performs the calculation:</p> <pre><code><fx:Script> <![CDATA[ public function calculate_volume():void { var height:int = parseInt(shape_height.selectedItem); var diameter:int = parseInt(shape_diameter.selectedItem); if(!isNaN(height) && !isNaN(diameter)) { // perform calculation // store answer in volume variable output.appendText(volume.toString() + "\n"); } } ]]> </fx:Script> </code></pre>

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