About #5: I have found that the close button's visibility was set to "show if resizable".
Now before setting it correctly, I would have to understand what is the purpose of the "link to button" property, as a couple of buttons are linked to each-other, and if I set the closebutton visibility to always show, hovering it will show the minimize button, which is a strange behaviour, but could be set nicely with aligning the link-to-button and visibility properties.