How to access the Graph/Image when plotted that using a /HIDE=1 option?

The "Display /HIDE=1wave1,wave2" command will have graph plot in the window but if now i want the same graph to come to the front how can we do it without creating another graph?

similarly my query extends to "NewImage" command.

If you know the name of the window (or specify it when you make it) you can make it appear like this

Make aa
Display/N=myWindow/HIDE=1 aa
DoWindow/F myWindow

Also by selecting Windows>Graphs>myWindow:aa from the menu bar. Same applies for Images which are just graph windows.