So, after quite a bit of time in Silverlight, I have learned that DataForms are very powerful entities. However, they like to hide from me what they are doing. Therefore, when I get into a situation in which I need to simulate their behavior, this often ends with me banging my head against a wall and typing my query into Google in as many different ways as possible. Recently, I have been attempting to force a validation on an object that was not in a DataForm... and I had no idea how. Fortunately, I stumbled upon this forum and it helped me. So that you don't have to bother reading it (that's why you're at my site, anyway, isn't it?) I have placed the important code snippet here:
BindingExpression bindingExpression = myTextBox.GetBindingExpresion(TextBox.TextProperty);
Poof! Your TextBox (assuming your TextBox variable is called "myTextBox") will validate.