I have logged this issue on our Feedback Portal. You can track its progress, subscribe to status changes and add your comment to it here
. I have also updated your Telerik Points
Set the color manually to workaround this:
radScrollablePanel1.PanelElement.Fill.BackColor = Color.FromArgb(245, 246, 247);
radScrollablePanel1.BackColor = Color.FromArgb(239, 239, 239);
Should you have any other questions do not hesitate to ask.
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