Fixed columns for PFGrid.SWT

A number of fixed columns can be defined for PFGrid.SWT. These columns will not be scrolled, just the ones which are not fixed:

Sample for adding fixed columns

final TreeListView treeList = viewer.getTreeListView();

VistaTreeListRenderer r = new VistaTreeListRenderer();
r.initialize(treeList);
treeList.setRenderer(r);

// Set 2 fixed columns for the grid
treeList.setFixedColumnCount(2);