Memory Graph to track Flash Player total memory usage

Sometimes it’s nice to keep an eye on the memory of an application without involving the Flash Builder profiler. This post demonstrates a simple and lightweight component that graphs the value of the Flash Player’s System.totalMemory over time. The chart can be very useful for noticing spikes in memory that might require further investigation with the profiler.
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Using DataRenderer to add custom states to a spark List renderer

ItemRenderer has logic built in that changes between some standard states like normal, hovered, selected, etc. You can supplement this logic by overriding ItemRenderer.getCurrentRendererState(), or do away with the built in states altogether by subclassing DataRenderer instead of ItemRenderer.
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Custom focus skin for spark components in Flex 4

In spark components, the focusSkin is treated differently from the normal skin. Unlike the skin of a spark component, the focusSkin is not automatically sized or positioned by the component. Instead, it is added as the first child of the component. In addition, if the focusSkin has a property called target, target is set to point to the parent component.
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Caching images loaded from a spark item renderer

I recently created a form in Flex that required using multiple DropDownLists with a custom item renderer that loads in preview images of each item. This was really easy to do initially, but I noticed a couple performance issues that bothered me. I decided to improve the performance by implementing a simple caching strategy.
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