The beauty of WPF/SL model is that logic and VI are separated. You can remove the spinner template part easily: open your page with a NumericUpDown in blend, select the numericupdown, right click and select "Edit Control Parts (Template) -> Edit a copy, navigate down the path of Template -> Grid -> Border -> Grid, select and delete Spinner, then here goes your number edit box, ie, a NumericUpDown without spinner. All NumericUpDown property and functions are still there: you can still set min/max/value/increment etc, using up/down cursor key inside the textbox will increase/decrease the value as if you are clicking on the repeatbutton, and coercion will happen too: as soon as you tab away, the number is coerced to be in the range of min/max. hope this helps.

** Closed by ningz 11/14/2008 10:55 AM

Thats my biggest complaint with silverlight and wpf. I agree, I could spend 20-30 minutes figuring out the template and then how to turn off the part I dont want. Or... the designer could put a showspinner template property. so i could just say showtemplate = false.

Is there a way we can achieve this with AutoComplete in SL3. I tried to hide the spinner or set opacity to 0, but it appiles the setting to the whole control.

Thanks

This is currently possible in NumericUpDown via changing the NumericUpDown.SpinnerStyle and the default template of the spinner.

See Ning's blog post for more details and a plethora of possible SpinnerStyle suggestions:
http://www.ningzhang.org/2008/11/19/customize-silverlight-toolkit-controls-numericupdown/