organizing the tree (dataexplorer), filtering...

[pawe]

An additional thought to my post above:

These "items hidden to the tree" have not necessarily to be a dead end for the tree:

If the active item and its parents ALWAYS show up in the tree (regardless if they are "hidden" or not), then also children of "hidden items" become selectable in the tree.
The hidden item itself can only be selected in the child items window. But then it shows up in the tree, and its children get selectable in the tree.

This requests a dynamic updating of the tree with every selected-item-change in the child item window.