Hi,
Thank you for your interest in Syncfusion Products.
I am afraid I was not able to reproduce the issue. To set focus to the numericUpDown control, please use the numericUpDown1.Focus() in the popupControlContainer_Popup Event. It numericUpDown control works fine after that.
Please have a look at the sample in this link
http://websamples.syncfusion.com/samples/Tools.Windows/F72326/main.htm and if still the issue exists, could you please try reproducing it in the above sample or send us the reproducing steps so that we could sort out the cause of the issue and provide you a solution?
Regarding IgnoreKeys, please check if the code snippet provided in this forum is useful:
http://www.syncfusion.com/support/forums/message.aspx?MessageID=70794Regards,
Anupama