Hi, 

We are using a XamCurrencyEditor which has the following properties set:

PromptChar = ' ';
FormatProvider = new CultureInfo("en-US");
Mask = "{double:-12.0}";

We are also overriding the OnKeyUp:

protected override void OnKeyUp(KeyEventArgs e)
{

if (e.Key == Key.K)
Text += "000";
else if (e.Key == Key.M)
Text += "000000";

base.OnKeyUp(e);

}

The XamCurrencyEditor works as expected when I manually type in the numbers and the negative sign, but when I push the K or M buttons it will break the mask.  

For example, if I were to type 1, then hold down M instead of it reaching the max of 100,000,000,000 it will actually go to 1000,000,000,000 (1 + the value in mask).  Now it won't let me leave the editor, but obviously I don't want it look like this.

I've tried handling different events but that did not work.

If I remove the "-" from the Mask, everything works fine.

The only ugly way I can get this to work is by parsing out the value in the mask and adding some conditionals for when to add to the Text.

Any ideas on how I can get this working in a cleaner way?

Thanks in advance for looking at my question.