Here is how you can set the BackColor of the title bar:
.TransparencyKey = Color.LimeGreen;
.FormElement.TitleBar.TitleBarFill.BackColor = Color.LimeGreen;
.FormElement.TitleBar.TitleBarFill.GradientStyle = Telerik.WinControls.GradientStyles.Solid;
Still using this approach is not reliable because you will be unable to drag the form. The transparency is limited in WinForms and there is no good way to overcome this limitation.
I hope this helps. Should you have any other questions do not hesitate to ask.
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