is there a tool or a button that can do that for al the directories at once ?
only in the location i am at that moment off course
my preference would be be click a button that that populates all the directoty sizes fields of the location im at the moment
Try the Calculate Folder Sizes command in the Edit menu.
Yes, it's extremely simple too, just put this in your new button:
GetSizes
and that's all that is needed for the exact functionality you've described.
(it does the same thing as the existing menu command which @lxp mentions above, which even has a keyboard shortcut so maybe you don't even need to bother with creating your own button)
thanks 