Once a UML class is associated with a source file by code reversal/generation, you can select from source file the corresponding UML class in Visual Paradigm.
Selecting UML Class in Model Explorer
To select the UML class from a source file, right-click on the class file in any tree or in code editor and select Select In Model from the popup menu.
Selecting UML Class in Diagram
To select the view of UML class from a source file, right-click on the class file in any tree or in code editor and select Select In Diagram… from the popup menu. If the class has been visualized with multiple views, you will be prompted to select a view to open.
