ValidationIssues

The ValidationIssues collection stores the issues created by the Validation.Validate([RuleSet as ValidationRuleSet][, Flags as ValidationFlags]) method and by the RuleSet.AddIssue([TargetPage as Page][,TargetShape as Shape]) method. It can be reset using the Clear() method, which will also zero the LastValidatedDate of the parent Validation object.

Most issues are automatically created by the Validate() method, but you can write code to add issues whenever the user clicks Check Diagram against a particular rule set. You would do this by listening to the RuleSetValidated(RuleSet as ValidationRuleSet) event of the Application, Documents, or Document object. This technique is used by the Microsoft SharePoint Workflow template in Visio 2010.

You can enumerate the current issues in a document, and check which rule has been transgressed.

Public Sub EnumerateIssues()
Dim issue As Visio.ValidationIssue
Dim shpName As String
Dim doc As Visio.Document
Set doc = Visio.ActiveDocument...