This method will reset all the control's backcolor to its default one. So invoke this method wherever you want.
private void ResetAllControlsBackColor(Control control)
{
control.BackColor = SystemColors.Control;
control.ForeColor = SystemColors.ControlText;
if(control.HasChildren)
{
foreach(Control childControl in control.Controls)
{
ResetAllControlsBackColor(childControl);
}
}
}
src : msdn[^]
-KR