Hi,
have you selected the desired image file name in the attribute FileName or AlphaName?
Using the attribute FileName will result in a bitmap resource already colorized with the colors taken from the image file.
Using the attribute AlphaName will result in the ALPHA only bitmap. This, however, only when the attribute FileName is empty.
In other words, ensure that only the attribute AlphaName is initialized. For example:

Does it solve the problem?
Best regards
Paul Banach