<Window x:Class="CustomControlsClient.MaskedTextBoxTest"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MaskedTextBoxTest" Height="300" Width="300"
     xmlns:lib="clr-namespace:CustomControls;assembly=CustomControls">
  <StackPanel Margin="10">
      <lib:MaskedTextBox Mask="(999) 000-0000" x:Name="maskedTextBox"></lib:MaskedTextBox>
    
  </StackPanel>
</Window>
