I have a TextBox control on a Windows Form that uses a DataSource custom object as its BindingSource. I have associated an ErrorProvider with the BindingSource like so:

    Dim dobExample As New DOExample

    ExampleBS.DataSource = dobExample
    epExample.DataSource = ExampleBS

The ErrorProvider fires if I type a blank space in the TextBox and then press Tab to move to the next control, which is correct. But it doesn't fire if I just press Tab without entering anything. I want the ErrorProvider to show the Error, even if the TextBox is empty and not just validate when there is text in the TextBox. How do I accomplish this?

As an additional bit of info, when I execute the following statement:

epDOContact.GetError(TextBox)

an empty string is returned even though the TextBox is empty when it is required to be present.