Hi Berthet,
Thank you for your interest in Syncfusion products.
UpDown control’s style can be applied by using the following attributes.
oBackColor
oBorderColor
oBorderStyle
oBorderWidth
oFont
oForeColor
oNegativeColor
These attributes can be configured through the UpDown control’s property window also.
BackColor="#FFCCFF" BorderColor="#3333FF" BorderStyle="Groove"
BorderWidth="2px" ForeColor="#3333CC" NegativeColor="Red" />
I have also prepared a simple sample which can be downloaded from the link below.
97430-100730278.zipKindly try the sample and Please let me know if you have any other questions.
Regards,
Varalakshmi.R.S