The Treeloader-Element load a tree from a causetree file.
It add all child elements of the root element of the loaded tree to the father of the Treeloader-Element.
It is possible to make several copies of the tree. The names of copied trees ended with '_' and its number.
The parameters of this trees can change after loading.
At this moment the number of copied trees must define befor copying. The number of copied trees cannot change dynamicly.