Remove initComponents() and layout the pane in Constructor

OPEN - task 30: Clicking "Create Item" when "CreateItemPane" active
bring JDialog with multiple Panes 
http://github.com/DevOpsDistilled/OpERP/issues/issue/30
Merge branch 'iss30-multiple-panes'
Merge pull request #31 from TheKojuEffect/master

Resolve bug issue #30