Block editting

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OK so I have managed to create a basic block & set Editable regions.
<?php $a = new Area('EditableRegion'); $a->display($c); ?>


now what if I want the editor to only be able to edit the current block assigned or only add from available specified blocks for this region?

say I am using 960 grid and want them to only be able to add blocks that would fit in a grid_5 class?