Spark List control measures wrong height

Question

I am developing Desktop Application using Flex/AIR and I have problem with Spark List control.

The case is the following: I have a list with item renderer. I do not use itemRendererFunction, so I have just one type of renderer. However this renderer can have different size, depending of the type of the data connected to it. Please see the code of my ItemRenderer:

<s:HGroup verticalAlign="middle">
    <s:CheckBox id="glazingNorthCheckBox" selected="false"/>
    <s:TextInput  text="{data is VerticalSolidComponent ? data.window.areaNorth : data.skylight.area}"/>
    <s:Label text="m²"/>
</s:HGroup>
<s:HGroup verticalAlign="middle" includeInLayout="{data is VerticalSolidComponentWithGlazing}" 
visible="{data is VerticalSolidComponentWithGlazing}">
    <s:CheckBox id="glazingEastCheckBox" selected="false"/>
    <s:TextInput text="{data.window.areaEast}"/>
    <s:Label text="m²"/>
</s:HGroup>

So as you see the second HGroup is not always included in layout. That is why my list is calculating wrong height.

Here you can see the code for the list:

<s:List id="solidComponentsList" dataProvider="{data.solidComponents}" itemRenderer="View.BuildingGeometry.DetailView.SolidComponentItemRenderer" skinClass="View.Skins.CustomListSkin" useVirtualLayout="true">
    <s:layout>
        <s:VerticalLayout gap="10" horizontalAlign="left" variableRowHeight="true" useVirtualLayout="true" paddingTop="20" paddingLeft="20" requestedMaxRowCount="4"/>
    </s:layout>     
</s:List>

Can you give me some advice how to calculate the correct size of the list?

Thank you in advance!

What is your actual question? Which size do you need to calculate? Height of List, number of items.. or what? And where do you do calculation? — Nemi, Jul 05 '13 at 14:09
Did you set [variableRowHeight](http://flex.apache.org/asdoc/spark/layouts/VerticalLayout.html#variableRowHeight)? — RIAstar, Jul 05 '13 at 14:38
What RIAstar said. You might as well show the code for your `List` too. — Sunil D., Jul 05 '13 at 17:50
Until now I do not override measure method. The list caluclates its height by its default implementation. My quistion is how to override this calculation so the list caluclatetes the correct height. I do not set variableRowHeigth. Where shoud I set this variable? — Ivan Nikolov, Jul 09 '13 at 10:03

Spark List control measures wrong height

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