Change color of text in header of dialogs

I'm using an InstallScript Project with InstallShield 2013 Pro.
Here i have several Dialogs, some default and some custom Dialogs.

Now we would like to change the small banner at the top of the dialogs.
I could change the bitmap in the background with the following in the script:

DialogSetInfo(DLG_INFO_ALTIMAGE, SUPPORTDIR ^ "ImgTop.bmp", TRUE);

Our ImgTop.bmp is very dark, so the default font color of black is not clearly visible.

Question:
How can i Change the color of the text in this header banner?

I could not find an equivalent like DialogSetInfo for the bitmap.

Thank you