TreeManager.addNewNodeAttribute

void addNewNodeAttribute(string attribute, gobject.value.Value value = null)

Requests that for any new node managed (eg. created) by manager, a new attribute will be set. This allows one to customize the attributes of new nodes created by an existing #GdaTreeManager.

As a side effect, if value is null, then the corresponding attribute, if it was set, is unset.

Parameters

`attribute`	an attribute name
`value`	the attribute's value, or null