DSL资源管理器中的永久节点

好吧,经过一番广泛的研究,我发现了如何做到这一点。以下是我所做的,以防将来有人需要我的问题的答案。必须为DSL模型的DesignerExplorer(它在DSLPackage项目中,由modelexplorer.tt文件创建)创建分部类,并在其中输入以下代码:

internal partial class MyDesignerExplorer
{
    /// <summary>
    /// Override to stop the "Delete" command appearing for
    /// Validators.
    /// </summary>
    protected override void ProcessOnStatusDeleteCommand( MenuCommand command )
    {
        // Check the selected items to see if they contain
        // Validators.
        if( this.SelectedElement.GetType()== typeof( Validators ) ) 
        {
            // Disable the menu command
            command.Enabled = false;
            command.Visible = false;
        }
        else
        {
            // Otherwise, delegate to the base method.
            base.ProcessOnStatusDeleteCommand( command );
        }
    }
}