Removing system colors from TcxDBColorCombobox

I have a TcxDBColorCombobox and I want the dropdown to not include system colors like clBtnFace , so it only includes colors like clRed.Also , I would like to include clWindow and clWindowText , but I can add them like custom colors. This process should be the same as for the TcxColorCombobox . I'm sure I'll figure it out eventually, but I thought I'd see if anyone else has any other experience.