For doing this MainFrameBarManager of the parent form has to be accessed and then it's bar visibility has to be set as False using the method SetBarVisibility. Please refer the below code snippet which illustrates this:
//Get hold of the MDIParentForm1
parent = this.MdiParent as Form1;
// Get the MainFrameBarManager in the MDI parent.
MainFrameBarManager mainManager = parent.mainFrameBarManager1;
// Parse through the bars, and hide them.
foreach(Bar bar in mainManager.Bars)
'Get hold of the MDIParent
Dim parent As Form1 = Me.MdiParent
’ Get the MainFrameBarManager in the MDI parent.
Dim mainManager As MainFrameBarManager = parent.mainFrameBarManager1
’ Parse through the bars, and hide them.
Dim bar As Bar
For Each bar In mainManager.Bars
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