Round Specific Corners of a Button in Flex

I want to round specific corners of buttons t开发者_JAVA技巧o create something like mx.controls.ButtonBar. But I cannot figure out how ButtonBar does this even after looking at its source. I thought the focusRoundedCorners css property was the answer but that applies only to drawing the button's focus box. Any idea on this would be greatly appreciated!

You can do this by creating custom skins for your buttons. Take a look at the source file in the Flex SDK for ButtonBarFirstButtonSkin.mxml (assuming you are using SDK 4). In a nutshell, when you draw the background/border/fill, you set topLeftRadiusX (or whatever corners you want rounded) on the Rect object. After creating your skin, assign it to the button in your CSS. Hope that helps.