Improvement of the error message layout when removing an object

[MauriceWillekens]

The layout of the error message can be improved. The message surface when a object is to be deleted in the map part of the application

[tomvantilburg]

Mmmh, chrome and firefox were doing this rather nicely....
But as windows adepts they must appreciate this kind of box ;-)

[tomvantilburg]

Moving this to future release.