Another common cause of issues: make sure it is the Silverlight type (TreeViewItemAdv in your example) you are specifying metadata for.

Hope this helps!

Thanks,

-Ning

I have created as assemblies and placed in a local folder and GAC. I am trying to open the assemblies from the local folder in the choose items dialog – Silverlight Components tab. Its selects all the classes in the assemblies and are added to toolbox.

So let me know how do I debug these projects

Regards,
Fider

Your code looks right. My suggestion is to step through to verify your code is loaded and executed correctly:
* Set a breakpoint at your Register function and see whether it is hit. VS2010 & Blend3 use newer MWD and a different entry point (IProvideAttributeTable.AttributeTable instead of IRegisterMetadata.Register); and if the name or location of your design dll isn’t right relative to the corresponding runtime dll, your design dll won’t be loaded either. This is a common cause of issues.
* If your breakpoint is hit, step through your code, then verify the effect, via AttributeTable.ValidateTable, AttributeTable.GetCustomAttributes, or TypeDescriptor.GetAttributes etc.

Hope this helps.

Thanks,

-Ning

Good Article. I have created design and visualstudio.design project for my Silverlight custom control. My objective is only to hide a class from the toolbox. I have a metadata.cs file where in I have set ToolboxBrowsableAttribute to false to the classes that should be hidded. My metadata.cs file looks like the following.

public class Metadata : IRegisterMetadata
{

public void Register()
{
AttributeTableBuilder builder = new AttributeTableBuilder();
builder.AddCallback(typeof(TreeViewItemAdv), b => b.AddCustomAttributes(new ToolboxBrowsableAttribute(false)));
MetadataStore.AddAttributeTable(builder.CreateTable());
}
}

But I could still get the class being displayed.

Any help will be appreciable.

Regards,

Fider.