Hi,

it is bug and will be fixed soon.

The workaround:

Move lifeline so, that it doesn't intersect with interaction use element. Then move interaction use element and then delete it. Ref element should be so deleted and lifeline preserved.

Right-click on Interaction Use element and in the context menu click on Add New Diagram (and choose the Sequence diagram item) or Add Existing Diagram (and select an existing sequence diagram from the list).

1. Press 'Interaction Operand' button in toolbox and hold mouse button pressed

2. Drag over Alt fragment and release mouse button

3. Double click on inserted rectangle (interaction operand) - properties dialog will be shown

4. Switch to Interaction Operand tab

5. Type the guard condition in the text box

6. Confirm the dialog using OK button

The hotfix allowed to change the start and end activation bar of sequence message (call, return, send). It is not possible to change the parent lifeline of activation bar. I agree, that it would be useful - I will add this option in the next release.

I released a new version (4.98), which supports moving activation bar to another lifeline.

Hi! I'm sorry, but it is not yet possible. I will add this possibility in the next release.

Try this hot fix - it contains implementation of your request:

http://www.softwareideas.net/SoftwareIdeasModeler.4.97HotFix.zip

This fix will be part of version 4.98, which will be released within one or two weeks.