Any pattern or nice solution to this ...

I have an app which goal is to model UML graphically and generate code from models.
My doubt is explained next:
I have the graphical base component where UML components are drawn. For example Class Diagrams, Interfaces, just the same than Rational Rose.
If I want to create a Class on the graphical component ( draw the class ) I need firt to use the creation bar where all buttons related to create graphical componenets are located.
If I click any of those buttons and then go and click somewhere on the base graphical component I need to check out what button was pressed.
How would be a nice way to perform this ?
I thought about creating a CreatorCmdBarStatus where we can post(currentCmd) and then when the mouse is clicked on the base graphical component, check out that CreatorCmdBarStatus to see which has been the last posted cmd ( either a class creation or interace creation and so on ).
Another solution using some elegant way to resolve this ?
Thanks.

I have an app which goal is to model UML graphically
and generate code from models.
My doubt is explained next:
I have the graphical base component where UML
components are drawn. For example Class Diagrams,
Interfaces, just the same than Rational Rose.
If I want to create a Class on the graphical
component ( draw the class ) I need firt to use the
creation bar where all buttons related to create
graphical componenets are located.
If I click any of those buttons and then go and click
somewhere on the base graphical component I need to
check out what button was pressed.
How would be a nice way to perform this ?
I thought about creating a CreatorCmdBarStatus where
we can post(currentCmd) and then when the mouse is
clicked on the base graphical component, check out
that CreatorCmdBarStatus to see which has been the
last posted cmd ( either a class creation or interace
creation and so on ).
Another solution using some elegant way to resolve
this ?
Thanks.It might not be exactly the same thing, but I wondered if there was a JRadioButton pattern for "ButtonGroup.getSelected(Radio)Button()...doSomethingWithIT()"
You wouldn't want to try something with (J)ToggleButton in a ButtonGroup (there you would even have user (UI) feedback)?

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Any pattern or nice solution to this ...

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