I am not exactly sure what you are describing. But you can resize the right pane - have you perhaps made it too small, almost invisible? If yes, try dragging the separator to the left.
How to get the right pane control back on to be able to select
Ya I AM TRYING OUT ICON EDITOR AND THE RIGHT PANE IS NOW SHOWING ICONS FROM REAL WORLD EDITOR AND I DON'T KNOW HOW TO CHANGE THE PANE BACK TO THE CONTROLS SO I CAN SELECT ALPHA AND THE CHECKERED BACKGROUND ETC.