add config lock

Add a lock on config form to avoid accidental changes
add cancel button for config

Now can use esc key to cancel, and don't change focus after change
server from list
revert
add cancel button for config

Now can use esc key to cancel, and don't change focus after change
server from list
change function to C# style

Change the first letter of function to upper case letter to fit C# code
style
handle no privilege error

Popup an error window when don't have enough privilege to change
Registry.
Merge remote-tracking branch 'upstream/master'
Merge pull request #35 from wzxjohn/master

add cancel button for config