2 bugs; I guess.

1)
When I try to create (all this via C++) a PANEL which has not a bitmap assigned, but is initialized with the respective rgb-values, I have a problem adding another button (which is a bitmap).

It seems as if only one color channel of the added button-bitmap is displayed

2)
When I set the panel flag to ^= INVISIBLE, the panel does not actually disappear.

Although invisible it still is a hindrance to access panels of a lower level.