Getting a different screen on MacBook Pro and VGA monitor

I have a MacBook Pro with Retina screen and have just connected a Samsung monitor to it using a Mini DisplayPort to VGA adapter. The wallpaper comes up on the Samsung but when you go into System Preferences and select Displays it says No Devices Detected but a SyncMaster window opens up on the monitor.
I can open an application on the MacBook and drag it across to the monitor although the toolbar with File, Edit etc stay on the MacBook. I can then expand it to fill the monitor. If I then open another application i.e Safari, the app othe monitor disappears. If I then reduce the size of Safari using the 2 arrows in the top right hand corner the app on the monitor comes back. I can then increase the sizeoftheapp on the MacBook by using the green button andcan then drag the size of the app to fill the screen but can't hide the toolbar at the bottom of the screen. I can then use the two apps independently but it's clumsy. Is this the only way it will work roam I doing something wrong?
Thanks

Right the external monitor is just an extension of your desktop. I think there is a setting, but I'm not sure where it is, that allows you to switch primary displays. Or you could set the system into Clamshell mode and us onl the external.

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Hello, benburn.
Thank you for visiting Apple Support Communities.
Here is a troubleshooting article that I would recommend going through when experiencing this issue.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
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Hi Steve,
I have had the exact same issues after adding a WD Thunderbolt Duo external drive to a Mid 2011 iMac and then daisy chaining the Dell U2410 monitor off that.
My Mini DP to DVI cable ceased working properly - sleeps issues.
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http://www.ebay.com.au/itm/3-in-1-Mini-Displayport-to-HDMI-with-audio-DVI-DP-ada pter-3in1-convertor-Macbook-/110861703462?pt=US_Audio_Cables_Adapters&hash=item1 9cfdf5926
I then tried all the different cables that came originally with the Dell U2410 with that adapter, and none of then would put the U2410 to sleep properly. The backlight would stay on, or "No Displayport Cable" would float around the Dell display with the backlighting still on. Or otherwise the Dell would try to go to sleep and then wake up again and cycle like you found.
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Getting a different screen on MacBook Pro and VGA monitor

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