text: ﻿<Window x:Class="MyCustomControl.Window1"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:uc="clr-namespace:MyCustomControl">
      <Grid>
        <uc:NumericUpDown />        
      </Grid>
  </Window>
  