Hi,
Thanks for your interest in Syncfusion Products.
If you are using ButtonAdv control in .net framework 2.0 you can set the MouseOver BackColor using the following code snippet.
this.buttonAdv1.FlatAppearance.MouseOverBackColor = Color.AliceBlue;
this.buttonAdv1.FlatAppearance.MouseDownBackColor = Color.HotPink;
Before that you should change the Button FlatStyle property to Flat and disable visual style.
Please refer to the attached sample and let me know if this is helpful for you.
F58458_SampleBest Regards,
Poly