It is not currently possible in a single step, but you can accomplish it this way:

1. Select all elements in diagram you want to copy (Edit/Select all or CTRL+A)

2. Create a new empty diagram of the same type

3. Paste copied elements (CTRL+V)

4. Choose whether you want create unbound independent copy (the first option - Paste as an independent copy) or you want share model of pasted elements with original elements (the second option - Paste as a new instance of the original model element).

5. Confirm your choice using OK button - you have a copy of diagram, now.

I hope I helped you.

P.S. In one of next versions I can add special feature for copying of diagrams.

If you want you can, but it is not necessary. I added your request to my task list.

Currently, it is not possible. I will improve it in the one of next releases.

However, there is a fast way how to do it now - firstly create the whole diagram, then select some class and press CTRL-T (Edit/Select All of Same Type), then you can suppress attribute and operation areas for all classes at once.

Hello,

it's possible this way:

1. Create two classes

2. Add association between them

3. Select association

4. Click on Add association class in context bar, which is displayed below the selected association

It is not yet supported. I will add it in version 5.0. The code will be completed this year - I'm planning the release for January 9th, 2012.

Hello,

the default visibility setting has not retroactive effect. It is applied only on newly created items. I could add a command for "batch" change of visibilities.

Thank you for these tips. I'll add key shortcuts for diagrams and also repeat-options in the next major version (5), which should be released soon - I'll finish it within few weeks - certainly this year.

You can make it this way:

http://youtu.be/H8TVtQgNJAs

I will try to make it easier in future versions.

Yes, I plan it. Maybe it will be not in the first release of version 5, but I suppose that this feature appears in one of its minor versions (5.x).

Were the ends of the relationship properly connected with classes before saving? When the end points are disconnected, they will be connected back after loading. I will change this behavior in the next version - the relation will be adjusted immediately after completing the dragging.