Hey Mark,

The error reminder control can be used for any Silverlight controls. Simply set the TargetControl and IsOpen properties:

  <TextBox x:Name="textBox1" Width="150" Height="22" TextChanged="textBox1_TextChanged" />

  public partial class Page : UserControl
  {
    private FpErrorReminder reminder;

    public Page()
    {
      InitializeComponent();

      this.reminder = new FpErrorReminder();
      this.reminder.TargetControl = this.textBox1;
      // the description will appear in the mouse-hover tool-tip
      this.reminder.ErrorDescription = "Upper case letter is not allowed";
    }

    private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
    {
      // the reminder shows up when the text contains upper-case letter
      this.reminder.IsOpen = Regex.IsMatch(textBox1.Text, "[A-Z]");
    }
  }

It is easier for FpErrorReminder to work with other Input Pro controls. You can show the reminder when the control value is out of the range defined by Max/MinValue:

<InputPro:FpDouble Width="180" Height="22" MinValue="0" MaxValue="100" ValueUpdateMode="Immediate">
    <InputPro:ErrorReminderService.ErrorReminder>
        <InputPro:FpErrorReminder ErrorDescription="Value out of range" />
    </InputPro:ErrorReminderService.ErrorReminder>
</InputPro:FpDouble>

Or you can show a piece of text as the reminder:

<InputPro:FpDouble Width="180" Height="22" MinValue="0" MaxValue="100" ValueUpdateMode="Immediate"
    InputPro:ErrorReminderService.ErrorReminder="Value out of range" />

The ErrorReminderService class reads the IsValid property of Input Pro controls and shows an error reminder when it is false.

Thanks,

Jimmy