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The color of the RadSplitPanels should be light blue as the background of the RadSplitContainer. I have added this issue to our Public Issue Tracker under ID: 11486. To vote for it and subscribe for its status updates follow this link: http://www.telerik.com/support/pits.aspx#/public/winforms/11486
. Please excuse us for the caused inconvenience. We will do our best to address the issue in a future release. Currently, you can easily avoid the gray color by setting explicitly the BackColor
of the control to Transparent
.radSplitContainer1.BackColor = Color.Transparent;
Thank you for reporting this issue. Your Telerik points have been updated.
Do not hesitate to write back if you encounter any other issues.
the Telerik team