GUI/View, Generating erratic OutOfRange Exceptions on the BarItem menus when clicking around in Toad (4275249)

Users may get OutOfRange exceptions on the BarItem menus when clicking around in Toad 6.0.

The error cannot be reproduced consistently but it happens regularly.

The exception generates the following:

Stack trace:
at System.Collections.ArrayList.get_Item(Int32 index)
at DevExpress.XtraBars.BarItemLinkReadOnlyCollection.get_Item(Int32 index)
at Quest.Toad.Editor.EditorForm.ExecuteSmartIdle(BarItem barItem)

New exception:
System.NullReferenceException: Object reference not set to an instance of an object.

Stack trace:
at Quest.Toad.Editor.EditorForm.ExecuteSmartIdle(BarItem barItem)
Outer exception:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.

Stack trace:
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments,Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj,Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Quest.Toad.ActionManagement.ActionInvoker.InvokeDirect(MethodInfo method, Object[] data)
at Quest.Toad.ActionManagement.UIActionEntry.UpdateStatus(Boolean force)

Outer exception:

Quest.Toad.Exceptions.IdleException: Idle delegate error:
Quest.Toad.Editor.EditorForm.ExecuteSmart, action: Editor.ExecuteSmart