Please describe the problem:
Dia incorrectly propagates properties among elements of
a group of objects.

Steps to reproduce:
1. Create two boxes: one with solid border, one with dashed border.
2. Select and group (CTRL+g) them.
3. Right click, select Properties...
4. Set the fill color to red or any other color you want.
5. Click the Apply button and close the Properties dialog.

Actual results:
Color changes correctly but
both boxes obtain the same border style.

Expected results:
Only color must change, border style should remain
the same: one solid and one dashed.

Does this happen every time?
yes

Other information:
Note that this is only an example.
The same happens also with more complicated objects
and shapes, ex. UML-class or ER-entity, which contain
text.