R394 - "Size of folders" button issue

[Dreamer]

- activate "Size of folders" with the toolbar button
- the button is 'enabled' and the size of folders in the current pane is shown
- switch to another pane
= the button is still 'enabled' but the size of folders in the current pane is NOT shown

...so in this case the button should be disabled, or the size of folders should be shown also foth the other pane.

FC R395, Windows Vista SP1.