title: DbiSchedule control on Escape key click exception is thrown cannot access a disposed object
body: <p>I am using DbiSchedule control in a form, on escape key click i am closing the form. Which throws an error ObjectDisposed exception and stackTrace is as follows :</p>
  
  <pre><code>System.Windows.Forms.dll!System.Windows.Forms.Control.CreateHandle()    
      System.Windows.Forms.dll!System.Windows.Forms.Control.Handle.get()  
      System.Windows.Forms.dll!System.Windows.Forms.Control.CreateGraphicsInternal()  
      System.Windows.Forms.dll!System.Windows.Forms.Control.CreateGraphics()  Unknown
      Dbi4.dll!Dbi.WinControl.DbiListControl.OnKeyDown(System.Windows.Forms.KeyEventArgs e)   
      System.Windows.Forms.dll!System.Windows.Forms.Control.ProcessKeyEventArgs(ref System.Windows.Forms.Message m)   
      System.Windows.Forms.dll!System.Windows.Forms.Control.ProcessKeyMessage(ref System.Windows.Forms.Message m) 
      System.Windows.Forms.dll!System.Windows.Forms.Control.WmKeyChar(ref System.Windows.Forms.Message m) 
      System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m)   
      System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m) 
      System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m)   
      System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.Callback(System.IntPtr hWnd, int msg, System.IntPtr wparam, System.IntPtr lparam)
  </code></pre>
  
  <p>No exception on ALT+F4, form closes successfully.
  Any ideas what is causing the exception and how I might go about fixing it? 
  Thanks in Advance.</p>