I recieved the same problem and tried your solution and it still would work..
>Hi Mushtaque,
By default,RibbonControlAdv Dock property is set to DockStyleEx.TopMost and the top row space gets filled with RibbonControl itself. In your application,please change the Dock property to DockStyleEx.Top as shown below in order to get this work.
this.ribbonControlAdv1.Dock = Syncfusion.Windows.Forms.Tools.DockStyleEx.Top;
Kindly let me know if this does not meet your requirement.
Best Regards,
Anu.
RibbonControlAndDockingManager0.zip