Closing the Plug-In makes the DAW crash

[yfede]

Rather than adding a SliderAttachment member to each Slider, why don’t you keep around this kind of struct for whenever you need such a coupling:

struct SliderWithAttachment
{
    ScopedPointer <Slider> slider;
    ScopedPointer <SliderAttachment> attachment;
};

This way, in your Editor you can simply add a member like:

SliderWithAttachment knob;

and voila, you have the knob.slider and the knob.attachment automatically deleted in the correct order, and also nicely bound together making the code more readable IMHO