18 Jul 2012
20 Jun 2008
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I tried to do this, but it instead makes whatever you put into that template be hard-wired (in other words, uneditable) to all of the pages under that template.
I think this would be a good idea to enable certain controls to be global. I also think it would be a good idea that when you add a control to a master page template, that it doesn't block out the whole contentplaceholder, but merely adds it automatically. currently if you add something to the master page template, that contentplaceholder gets greyed out of the editor.