- show/hide the context menu items instead of creating and adding new ones each time the context menu opens
- right click menu with rescan/add was not available for empty list or when empty space was clicked
- the condition for the edit button was slightly different from the edit toolstripmenuitem
- improved button layout (part of CA-100083)
- tidied up button event handlers and renamed one or two class members
- removed unused parameter in constructor and method of VDIRow
Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>