TextBox problem

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XAML

Hi to all,

I have one TextBox, like the below...

<controls:numerictextbox x:name="numquot" 
       HorizontalContentAlignment="Right"
       Style="{StaticResource NumericTextBox}"     
       Text="{Binding Path=Rate, UpdateSourceTrigger=PropertyChanged,StringFormat={}{0:C}};

</controls:numerictextbox> 

and this is my style for TextBox...

<Style x:Key="NumericTextBox" TargetType="{x:Type TextBoxBase}" BasedOn="{StaticResource {x:Type TextBoxBase}}"
            </Style>

The Problem is:
When I type numerics in that is going to display as worng information.

Example : when I type 52 it is going to display like $25.00 and when I type like 129, it is going to dispaly like $921.00.

I hope you understood the problem.
Can you please help me.