Hi Andrew,
In a MDI scenario, you should always add the BarItems to the merged Bar''s Items collection and not to the original Bar''s Items collection as shown in code below :
this.mainFrameBarManager1.GetMergedEquivalent(this.bar1, this.bar1).Items.Add(pbitem);
Please refer to the
test sample that illustrates this and let me know if it helps.
Regards,
Guru Patwal
Syncfusion,Inc.