Well @Palaniyappan @Gabriel_Toth
I am not sure I fully understood the question, here is what I get from the above.
The OP has to expand the tree-view and extract only the text? or click it? or do some operations on ‘ALL’ the expandable lists or just the one in question that is highlighted?
Find children would be the optimal solution for .net apps and web, but if it is only one expanding list then dynamic selector is the way to go - it is faster and easier to implement.
Get back with more details I will surely help out