Hi Christian,
Thanks for your interest in Syncfusion products.
There is no straight forward method or property available to set the Back color of the DockTabcontrol in DockingManger. But you can set the back Color by getting the DockTabControl object from DockHostController.
[C#]
Syncfusion.Windows.Forms.Tools.DockHost dhost = this.panel1.Parent as Syncfusion.Windows.Forms.Tools.DockHost;
Syncfusion.Windows.Forms.Tools.DockHostController dhc = dhost.InternalController as
Syncfusion.Windows.Forms.Tools.DockHostController;
if (dhc.ParentController is Syncfusion.Windows.Forms.Tools.DockTabController)
{
Syncfusion.Windows.Forms.Tools.DockTabControl docktab = (dhc.ParentController as
Syncfusion.Windows.Forms.Tools.DockTabController).TabControl;
docktab.TabPanelBackColor = Color.DarkBlue;
}
Please refer to the attached sample and let me know if this is helpful for you.
http://websamples.syncfusion.com/samples/Tools.Windows/F61728/main.htm