Thanks for your patience.
On further analysis we have found that, SuspendDockBarsRedraw() and ResumeDockBarsRedraw() methods have been removed from the latest version. To avoid flickering, we use LockHostedFormForMDIChanges property as follows.
this.MainframeBarManager1.LockHostedFormForMDIChanges = true;
.....
.....
this.MainframeBarManager1.LockHostedFormForMDIChanges = false;
Please let me know if any concerns.
Regards,
Fathima