Bug #66316 tryed to edit a table on the model, and crashed

Description:
tryed to edit a table on the model, and crashed

----- Developer Notes -----

MySQL Workbench CE for Windows version 5.2.41  revision 9727
Configuration Directory: C:\Documents and Settings\esparenberger\Dados de aplicativos\MySQL\Workbench
Data Directory: C:\Arquivos de programas\MySQL\MySQL Workbench 5.2 CE
Cairo Version: 1.8.8
OS: Microsoft Windows XP Professional Service Pack 3 (build 2600)
CPU: 2x Pentium(R) Dual-Core  CPU      E5700  @ 3.00GHz, 3.0 GiB RAM
Active video adapter (0): Intel(R) G41 Express Chipset
Installed video RAM: 256 MB
Current video mode: 1920 x 1080 x 4294967296 cores
Used bit depth: 32
Driver version: 6.14.10.5090
Installed display drivers: igxprd32.dll
Current user language: Português (Brasil)

Exception = System.InvalidCastException
Message = Não é possível converter um objeto do tipo 'MySQL.Forms.ToolBarItemImpl' no tipo 'MySQL.GUI.Workbench.Plugins.DockablePlugin'.
FullText = System.InvalidCastException: Não é possível converter um objeto do tipo 'MySQL.Forms.ToolBarItemImpl' no tipo 'MySQL.GUI.Workbench.Plugins.DockablePlugin'.
   em MySQL.GUI.Workbench.Plugins.DockablePlugin.GetFromFixedPtr(IntPtr ptr)
   em MySQL.GUI.Workbench.MainForm.ShowPlugin(IntPtr ptr)
   em MySQL.Forms.AppImpl.show_editor_wrapper(UInt32 native_handle)
   em boost.detail.function.void_function_invoker1<void (__cdecl*)(unsigned int),void,unsigned int>.invoke(function_buffer* function_ptr, UInt32 a0)
   em wb.WBContext.flush_idle_tasks(WBContext* )
   em MySQL.Workbench.WbContext.flush_idle_tasks()
   em MySQL.GUI.Workbench.Program.timer_Tick(Object sender, EventArgs e)

How to repeat:
use the model uploaded, and try to edit the table prct_contatoprospectitem

Duplicate of bug #66013