In SQL Server Management Studio,developers can view or hide query results pane by using shortcut key CTRL + R in SSMS 2008.
But in SSMS 2012,after installing SQL Server 2012,shortcut key CTRL + R was not working to view/hide results pane.
Below images will show how to view/hide results pane :
Below images will show how to assign shortcut key CTRL + R to view/hide results pane:
In SSMS,Goto Tools -> Options... - > Keyboard

do the settings as shown,click Assign and Ok

Close & re-open SSMS to test working of Show/Hide Results Pane using shortcutkey CTRL + R
But in SSMS 2012,after installing SQL Server 2012,shortcut key CTRL + R was not working to view/hide results pane.
Below images will show how to view/hide results pane :
Below images will show how to assign shortcut key CTRL + R to view/hide results pane:
In SSMS,Goto Tools -> Options... - > Keyboard
do the settings as shown,click Assign and Ok
Close & re-open SSMS to test working of Show/Hide Results Pane using shortcutkey CTRL + R