I just commit in the Vcl Styles Project two new fixes to patch the QC 114040 and QC 114032 (these issues exist in Delphi XE2 and XE3), both reports are related to the Highlight colors used to draw the TColorBox and TComboBoxEx components when the Vcl Styles are active.
The TColorBox control doesn’t use a Style Hook, so the fix was done using a interposer class. To apply the path just add the Vcl.Styles.Fixes unit to your uses list after of the Vcl.ExtCtrls unit. And the result will be
The TComboBoxEx control have a similar issue.
In this case fixing the Style Hook related to the TComboBoxEx control was the key.
To apply this fix, just register the TComboBoxExStyleHookFix style hook located in the Vcl.Styles.Fixes unit.