The flags that indicate how the button cell shows its alternate state.
- macOS 10.0+
The value of this property is the logical
OR of one or more of the cell masks described in the "Constants” section of
NSChange are specified, both are recorded, but the actual behavior depends on the button cell’s image. If the button has no image, or if the image has no alpha (transparency) data,
NSChange is used. If the image exists and has alpha data,
NSChange is used; this arrangement allows the color swap of the background to show through the image’s transparent pixels.