If you follow the Steps in the JProbe Memory leak tutorial you will be unable to continue past Step 3 because the Memory Leak button is disabled.
The tutorial states in Step 2 Point 5 to click the drop down on "Finish Use case", and select "Do not include Heap dump in snapshot". If you do this you will then not be able to diagnose where the memory leak originates from once filtering out the *.JButton.
To continue through the tutorial it is necessary in Step 2 Point 5 to make sure you select "Include Heap dump in snapshot" when you Finish your Use Case.
You should then be able to continue the steps and investigate your loitering objects using the Memory leak button which will now be enabled.