I am calling a python tool (i.e. within a python toolbox) using the pythonaddins.GPToolDialog() function. The call to the to tool is made from within a python add-in button tool. The python tool dialog box launches with no problem, but the dialog box is modal. I would like it the user to still be able to interact with ArcMap. Has anyone been able to launch a non-modal tool dialog? Or, is this just a limitation? I am on 10.2.1.