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POHow to prevent Silverlight RIA Entity getting attached to datacontext before i'm ready
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copied!<p>I have a Silverlight 4 application for a simple 'TODO' list. The problem I'm having is that databinding is hooking up relationships on my <code>TODO</code> object, which causes the RIA data context to add it to the <code>DataContext.TODOs</code> list before I want it there. I want to treat the object as new and detached until I'm explicitly ready to add it to the datacontext.</p> <hr> <p>Here's how it works : I've got my <code>TODO</code> entity which is associated with a <code>Status</code> (RIA services entity relationship).</p> <p>I create a new <code>TODO()</code> entity which is passed to a <code>ChildWindow</code> popup. Notice that I don't add this new entity to my datacontext.</p> <pre><code> new CreateTODOPopup(new TODO()).Show(); </code></pre> <p>In the DataForm in my ChildWindow I have a combobox for <code>Status</code> which is databound to <code>DataContext.Statuses</code>.</p> <p>The problem is that the action of selecting a <code>Status</code> from the dropdown actually associates the entity to the context for me - ending up giving it a state of <code>EntityState.New</code> and actually adding it to the <code>DataContext.TODOs</code> colleciton. </p> <p>This would be fine except that it now appears in the main TODO list in the main frame. I don't want this becasue it hasn't been committed by the ChildWindow yet.</p> <p>How can I solve this? Either by preventing the entity from becoming attached - or by somehow hiding it from any controls it is bound to until it has been added.</p>

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