Thank you for writing.
If I understand correctly you want to change the form BackColor
for the Office2010Silver theme. This can be done by using Visual Style Builder (please refer to the attached image). Please note that the default color is "Control" and I am not sure to what color you want to change it.
Also this can be done in code like this:
.BackColor = Color.FromKnownColor(KnownColor.ControlLight);
The following articles are very useful when you need to edit the predefined themes with Visual Style Builder:
Let me know if you have additional questions.
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