Using 256 color icons for Form Caption

Hi,

When changing the default icon that was loaded on startup of the application the colors of a 256 color icon is correct. When the icon is changed from within the application, colordepth is set back to 16 colors.

The icons used only contain a 256 color bitmap image, no 16 or true color bitmaps are included.

How can I change the icon preserving all the color used?

Thanks,

Jeroen.