Most of our controls apply two inbuilt style sheets. The first one is a base
CSS which includes padding, margin, dimensions or background position. The second one is a skin
CSS. It applies colors or background images.
Along of developing of our controls and reducing resources to make them lighter, we have changed background images used in our inbuilt skins. By changing images we have modified background positions as well. If you are applying your custom background image for customizing a RadComboBox, it is possible
that after upgrading to newer version the layout will be broken.
Therefore we recommend to use light weight render mode which do not use images for displaying gradients or rounded corners.
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