Hello,
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Have you tried a custom skin? You can build your own skin using an online tool that can be found here:
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http://stylebuilder.telerik.com/
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Please check our documentation for more details. If you're on QuickApps 6.3 for SharePoint 2013 then you can find a fully functional custom skin called SharePoint2013 under the following location (please adjust the path to the your 15 hive folder).
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C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\TEMPLATE\LAYOUTS\QuestSoftware\Telerik\Q32013SP1\Skins
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Let me know if this helps.
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Thanks,
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