I am using this code
Me.UltraToolbarsManager1.Toolbars(0).Tools("Configuration").CustomizedVisible = DefaultableBoolean.False
and it works fine with PopupTools but when i try to use this for as single Buttontool I got an Exception "Key not found Parametername: key".
I have tried to hide the Buttontool using your code and everything was working fine like the other tools. Are you sure that you have use the correct key? Did you try to use the index of the Buttontool instead of the key?
Is so which version are you using, try to get the latest service release?
I hope this helps.
Developer Support Engineer
Developer Support Manager
thanks a lot for your quick reply.
after changing to version 10.2 it works again.