I had a post while ago about ADF multi task flow binding and loading dynamic regions - Building Custom UI Shell with ADF 11g R2. In that sample, new region was opened in the first tab position. Meaning tab order was from right to left. It is more natural to have left to right tab opening order. This can be done too, check updated sample app - we need to control disclosed property and add new region to the end of array.
Sample app - MultiTaskFlowApp_TabOrder.zip. Sample app contains four regions that can be opened dynamically. Let's say user opens region Locations: Read the complete article here.
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