Added tooltip to display details of items in TreeView

[Tony Yum <tony tony-yum co uk>]

Dear all,

I have just started using gtkmm and forgive me if the question might be 
a bit silly. But I don't seemed to be able to add tooltip to treeview 
items. i.e. I wish to display detail of the items in the treeview when I 
hover hover it. The tooltip object sets the text for the entire 
treeview, so I thought about listening to mouse motions on the treeview 
widget and then setting the tooltip appropriately. However as soon as I 
add content to the tree, the signal_motion_notify_event no longer sends 
signal to the slot that I connected to.

Thanx in advance.

Tony