First check is it NodeSearchElement and then which key was pressed.
Comments added.
Bugs are fixed
Merge pull request #159 from vmoyseenko/DUI-LeftRightArrowCrashesDynamo

DUI: left right arrow crashes dynamo
Merge pull request #162 from vmoyseenko/DUI-NoActionsLblForSomeSP

StandardPanel with Queries only doesn't have a header
Members are moved from class to namespace
Merge remote-tracking branch 'remotes/origin/Sitrus2' into DUI-OpenOneCategotyAtATime