Mapguide Maestro on Mono (Linux): cannot create Feature source

[gabrimonfa]

Mapguide Maestro 3.5b2

Ubuntu 11.04

Mono 2.6.7 (from official package 2.6.7-5ubuntu3)

Trying to create a new Feature source results in the following error:

System.NullReferenceException: Object reference not set to an instance of an object
  at Maestro.Base.Commands.NewItemCommand.Run () [0x00000] in <filename unknown>:0 
  at ICSharpCode.Core.WinForms.MenuCommand.OnClick (System.EventArgs e) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ToolStripMenuItem.HandleClick (System.EventArgs e) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ToolStripItem.FireEvent (System.EventArgs e, ToolStripItemEventType met) [0x00000] in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.ToolStripItem:FireEvent (System.EventArgs,System.Windows.Forms.ToolStripItemEventType)
  at System.Windows.Forms.ToolStrip.OnMouseUp (System.Windows.Forms.MouseEventArgs mea) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ToolStripDropDown.OnMouseUp (System.Windows.Forms.MouseEventArgs mea) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control.WmLButtonUp (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ScrollableControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ToolStrip.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ToolStripDropDown.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) [0x00000] in <filename unknown>:0 

This error does not appear on the Windows version of Maestro

[jng]

Fixed r6050