I've got a problem. I wan't to put a User Control in a form, but I can't see the form in design mode. There's a exception being thrown:

"Unable to cast object of type 'System.Collections.Generic.List`1[DomainEntities.Interfaces.ITreeNodeEntity]' to type 'System.Collections.Generic.List`1[DomainEntities.Interfaces.ITreeNodeEntity]'.
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at VSproj.Controls.TPGroupingTreeView.set_CheckedItems(Object value) in C:\VSproj\Controls\TPGroupingTreeView.vb:line 136
at VSproj.UserControls.DetailViews.GroupingPersonTreeView.InitializeComponent() in C:\VSproj\UserControls\DetailViews\GroupingPersonTreeView.Designer.vb:line 108
at VSproj.UserControls.DetailViews.GroupingPersonTreeView..ctor() in C:\VSproj\UserControls\DetailViews\GroupingPersonTreeView.vb:line 66 "

I've tried puttingIf Not Me.DesignMode but it doesn't seem to work.

Help please.

Your code in GroupingPersonTreeView.InitializeComponent method tries to set checked items - something that you would normally want to do at run-time. Follow the stacktree up and see what code is causing it and make sure it is not called at Design time. Remember that constructors and InitializeComponent are used by the Designer engine, so don't put there anything that suppose to run at run-time only.

Hope this helps,

Aleksey

Your code in GroupingPersonTreeView.InitializeComponent method tries to set checked items - something that you would normally want to do at run-time. Follow the stacktree up and see what code is causing it and make sure it is not called at Design time. Remember that constructors and InitializeComponent are used by the Designer engine, so don't put there anything that suppose to run at run-time only.

Hope this helps,

Aleksey