Ctrl R not working in SQL Server?

Ctrl + R: it's general thing which SQL Developer uses often in day.

     Some times this Result Pane won't work, so we can again create this short cut, please go through below steps.

1. go to Tool > ..Options > Keyboard > Keyboard

2. Select Window.ShowResultsPane under Show Commands containing

3. SQL Query Editor under Use new short cut in:

4. Click empty space of Press Shortcut Keys:then give your Shortcut Key (pres your           
     required shortcut key)