Use the URLredirector widget, this has the options for new window/tab. Pass a non-persistent object to a popup page and use a Microflow timer to close this after some seconds
Thanks for your response Pim.
With this widget I only can open a url but I think I want to run a Microflow in a new tab.
I want to open a Mendix page /form in the new tab/window.
So that means I want to pass a context object via microflow and open a new tab (the new page) with a dataview of this context object.
Is that possible?