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In order to achieve a ComboBox in a DataGrid, you will need to create a ComboBox as a itemRenderer and itemEditor, bind your initial collection of data to the DataGrid's dataProvider and invoke a method whenever a change event is detected on one of the ComboBoxes.
The solution is to simply bind your XML to the dataprovider of your list and set the itemRenderer of your list as a checkbox.
Skinning a Spark DataGrid Column Header Requires a couple extended SDK classes, but is straightforward once learned. In order to skin or color a Spark DataGrid header, we'll need to look at DataGridSkin and DefaultGridHeaderRenderer.
The solution is to use a Timer object so that you can periodically trigger a method which can check the time from a Date object.
You can do this by defining a RadioButtonGroup and having a RadioButton ItemRenderers for a DataGroup which make themselves part of the RadioButtonGroup.
Creating a radar chart will require drawing Axes, Series and the necessary trigonometry to determine how to draw those items.
Applying styles to an Alert in Flex 4 is similar to applying a style in Flex 3. Either a style tag or separate CSS file are needed.
Changing or removing the datagrid row and column separators requires creating a new data grid skin and applying that skin.