Giving different ContainerControllers different text colors

I’m struggling with setting custom formatting properties on different [FONT=“Courier New”]ContainerControllers[/FONT] assigned to a single [FONT=“Courier New”]TextFlow[/FONT] instance. I can assign different [FONT=“Courier New”]columnCount[/FONT] properties and those display as desired, but other properties such as [FONT=“Courier New”]color[/FONT] seem to be ignored. I have tried this syntax:

myContainerController.color = 0x00ff00;
myContainerController.columnCount = 2;

I have also tried:

var tlf:TextLayoutFormat = new TextLayoutFormat();
tlf.color = 0x00ff00;
tlf.columnCount = 2;
myContainerController.format = tlf;

In both cases, the [FONT=“Courier New”]columnCount[/FONT] is set correctly, but the [FONT=“Courier New”]color[/FONT] is ignored. Is it possible to affect the color of the displayed text? That would seem to be one of the primary advantages of TLF text? Any help would be appreciated. Thanks!