Telerik UI for Windows Phone by Progress

The RadNumericUpDown control allows you to format the value displayed in it. To do that you have to specify a format string appropriate for the numerical value and set it to the ValueFormat property of the RadNumericUpDown control. 

Tip
Defining format strings in XAML can be done in the following way - "{}:{0:your format string}" or "your format string".
CopyXAML
      <telerikInput:RadNumericUpDown x:Name="radNumericUpDown" VerticalAlignment="Center" ValueFormat="{}
{0:0.00}" />
CopyC#
this.radNumericUpDown.ValueFormat = "{0:0.00}";

This is equivalent to the following:

CopyXAML
<telerikInput:RadNumericUpDown x:Name="radNumericUpDown" VerticalAlignment="Center" ValueFormat="0.00" />
CopyC#
this.radNumericUpDown.ValueFormat = "0.00";
Note
To learn more about formatting visit the Formatting Overview chapter in MSDN.

Here is a snapshot of the result.

Numeric Up Down-Formatting-01