Memory graph in Memory tab is not redrawn until the next redraw interval.

To reproduce:

1. start jconsole with -interval=20
2. switch to Memory tab, select perm. gen. in Chart combo box.
3. Wait until the graph is redrawn and quickly select 'Heap Memory Usage' in the combo box.

The graph will not be redrawn immediately.

Please redraw it immediately.
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