Question : Visio 2007: Can't access UML diagram properties

I am using Visio 2007 and Vista Home Premium SP1.
I open "UML Model Diagram" template, drag the class diagram icon to my page. I want to add attributes and behaviors to my class diagram, but can't do so. If I double click on the class diagram box, I can enter a class name, but I can't add anything else.

I recall that in the past (a year ago with possibly an older OS?) I was able to enter attributes and behaviors by right clicking and choosing properties. Now, none of my right click menu options do anything. I am able to use the right-click menu for other templates - just not the UML diagram template.

I've spent 2 hours looking for help on the Internet, but nothing works. I followed a suggestion to start with a UML "package," but I can't do anything with the package after I drag it onto my page.

I have uninstalled Visio and reinstalled and have the same problem.

Answer : Visio 2007: Can't access UML diagram properties

Happy New Year, John. Back at this after a couple of days off...

Let's check a couple of relatively obscure Visio settings:

1. Visio add-ins: let's make sure that operation of add-ins isn't restricted in your copy of Visio for some reason. Select Tools/Trust Center from the Visio main menu, then click Add-ins in the left navigation pane. There should *not* be a checkmark next to "Disable..." as shown in the first image below. If there happens to be one there, remove it, then stop and restart Visio. 
2. Automation: Select Tools/Options from the Visio main menu, then click the Advanced tab. Ensure that there *is* a checkmark next to Enable Automation events. Refer to second image below.
    

Let me know if either of these solves the problem.

trust-center.jpg (353 KB) (File Type Details) 

Visio 2007 trust center

automation-events.jpg (111 KB) (File Type Details) 

Advanced settings