How to change default launcher

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http://androidforums.com – Hi. I'm new in Android... so sorry if this is obvious. I added a launcher to my tablet. When I press home key, android ask me what the default launcher to use. I selected the default (not the new) and I mark the checkbox to use always this launcher. Now I want to use by default the new launcher but I can't, whem I press the home key always the default launcher is fired. I found a lot of threads to do the oposit, ie, in app make a reset on the new launcher. But my problem is I can't find in app the "standard" launcher to do a reset. Someone can help me? Regards Carlos (General)