The Tree Window

The Tree Window is located at the left. This appears when the elements button is clicked. It displays a list of all the elements found in the currently opened haskell file, and categorises them under the appropriate sub-node according to there type.

It contains three buttons at the top of the window  that allow you to expand, collapse and refresh the tree.  

It allows you to debug , go to the definition, and run tests on the selected element in the tree window.