Shortcut key to expand the selected collapsed block/region in Visual Studio C#

It is very frustrating to hold mouse just when my cursor is on the correct location but I can't expand the block.

I use Ctrl+M , Ctrl+O to collapse to definition. Bu开发者_开发问答t not able to expand one of the block after that. I have to hold the mouse and click on the plus sign.

Thanks in advance.

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Here Ctrl+M, Ctrl+M toggles expansion.

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It worked for me when i tried like this - Ctrl + M ,M ; Ctrl + M, M ;