Yes, you can customize the dialogs appearance through the DialogsCssFile
property and yes, there is a known problem when this property is used with a custom skin: The DialogsCssFile property breaks the appearance of a custom skin
To fix the DialogsCssFile problem please explicitly set the RenderMode
property of RadEditor to "Lightweight
<telerik:RadEditor RenderMode="Lightweight" DialogsCssFile="~/CustomSkinName/DialogContents.css" Skin="CustomSkinName" EnableEmbeddedSkins="false"
ID="RadEditor1" runat="server" >
<ImageManager ViewPaths="~/" UploadPaths="~/" />
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