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If some of the fields in your control should handle messages (such as Select All, Invert, etc.), override the HandleMessage method and delegate messages to appropriate fields.

 1 public override void HandleMessage(Sitecore.Web.UI.Sheer.Message message)
 2       {
 3          
 4          if(message["id"] == this.ID)
 5          {
 6             Sitecore.Shell.Applications.ContentEditor.Checklist list = FindControl(GetID("list")) as Sitecore.Shell.Applications.ContentEditor.Checklist;
 7             Sitecore.Shell.Applications.ContentEditor.Text text = FindControl(GetID("text")) as Sitecore.Shell.Applications.ContentEditor.Text;
 8             if(list != null)
 9             {
10                string messageText;
11                if ((messageText = message.Name) == null)
12                {
13                   return;
14                }
15 
16                if (messageText != "checklist:checkall")
17                {
18                   if (messageText == "checklist:uncheckall")
19                   {
20                      list.UncheckAll();
21                   }
22                   else if (messageText == "checklist:invert")
23                   {
24                      list.Invert();
25                   }
26                }
27                else
28                {
29                   list.CheckAll();
30                }
31             }
32          }
33 
34          base.HandleMessage (message);
35       }

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