To optimize the RadEditor's loading, the toolbar loads a single image sprite (but not different multiple icons for every tool as the classic editor
), which contains the appearance of all tools: ToolBarSprites.gif - contains the images for the vertical toolbars and other horizontal elements.
We load the different icons by positioning the sprite image with css top and left properties. You can find information about this in the following help article RadEditor for ASP.NET AJAX CSS: Classes and Their Use Abstract
as well as see the attached image.
You can check the position of each of the icons in the sprite in the external css files of RadEditor and implement your scenario using the sprite.
Another approach is to download manually the icons from this help article: Introduction to Toolbars
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