In a form I have some tabs (in a tabControl).

I need to change the toolbar list in dependence of the selected tab.

Some of toolbars linked with a tab should be not available when an other tab is active etc. 

How can I "hide" from users tabs

I generate  a 
_Toolbars As List(Of UltraToolbar)

then I 

Me._ToolbarsManager.Toolbars.AddRange(Me._Toolbars.ToArray())

Now I tried to do the following when switching the tab

    _ToolbarsManager.Toolbars.Clear()
    _ToolbarsManager.Tools.Clear()
    _ToolbarsManager.Toolbars.AddRange(newToolbarsList.ToArray)

but this does not work: from the ancient toolbars just dissapeared all the buttons but they didn('t dissapear.... and I didn't see any new toolbar appearing...