Hi Brett,
Thanks for your interest in Syncfusion products.
1. It is not possible to remove the margin between the button & the edit box.
2. You can set the Child Button Flat style property for avoid the raised look. By default the Flat Style property is set to Standard.
Please refer to the attached sample and let me know if you need more assistance with this incident.
http://websamples.syncfusion.com/samples/Tools.Windows/F59457/main.htmBest Regards,
Poly