Select model element with user interface

I know this is an old post, but for future reference, this problem has been solve in a different post: https://discourse.pyrevitlabs.io/t/select-model-element-from-ui-upon-button-click/1512

You hide and show the window before and after your selection with:
self.Hide()
self.Close()

so your code looks something like this:

def face(self, sender, args):
    self.Hide()
    a = uidoc.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Face) 
    self.Close()

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