Setting Button component styles in Flash with ActionScript 3.0

// ActionScript 3.0
// Import the required component classes.
import fl.containers.UILoader;
import fl.controls.Button;
import fl.controls.DataGrid;
import fl.controls.dataGridClasses.DataGridColumn;
import fl.data.DataProvider;
 
// Create some variables.
var styleArray:Array = new Array();
var styleObject:Object = Button.getStyleDefinition();
var styleName:String;
 
/* Convert the styles returned from the getStyleDefinition() method into an 
   array of objects so it can be converted to a data provider. */
for (styleName in styleObject) {
    styleArray.push({name:styleName, value:String(styleObject[styleName]), data:styleObject[styleName]});
}
 
// Sort the items in the styleArray array alphabetically by name. 
styleArray.sortOn("name", Array.CASEINSENSITIVE);
 
// Create a new DataGridColumn object.
var nameCol:DataGridColumn = new DataGridColumn("name");
nameCol.headerText = "Style name:";
 
// Create a new DataGridColumn object.
var valueCol:DataGridColumn = new DataGridColumn("value");
valueCol.headerText = "Default value:";
 
/* Create a new DataGrid component instance, add the two DataGridGolumn objects created
   earlier, set the data provider to the styleArray array, and add to the display list. */
var styleGrid:DataGrid = new DataGrid();
styleGrid.addColumn(nameCol);
styleGrid.addColumn(valueCol);
styleGrid.dataProvider = new DataProvider(styleArray);
styleGrid.setSize(530, 300);
styleGrid.move(10, 10);
styleGrid.addEventListener(Event.CHANGE, changeHandler);
addChild(styleGrid);
 
/* Create a UILoader component instance, and add it to the display list. This UILoader will
   be used to display the selected style, as long as it is a visual asset. */ 
var previewLoader:UILoader = new UILoader();
previewLoader.setSize(530, 70);
previewLoader.move(10, 320);
addChild(previewLoader);
 
/* Handler function for the UILoader component instance. This function gets the currently 
   selected item in the data grid and attempts to set the UILoader instance's source property
   to the selected item's data property. If the item cannot be displayed in a UILoader, the
   UILoader instance's source property is set to null which causes any previously displayed
   content to be cleared. */
function changeHandler(evt:Event):void {
    var item:Object = DataGrid(evt.currentTarget).selectedItem;
    try {
        previewLoader.source = getDefinitionByName(item.data);
    } catch (error:*) {
        previewLoader.source = null;
    }
}