FIX: initialize interactor, add RightButtonRelease binding

Wrapping/Tcl/vtkinteraction/bindings-iw.tcl

@@ -198,6 +198,10 @@ namespace eval ::vtk {
                 [$istyle AddObserver RightButtonPressEvent \
                 "::vtk::cb_istyleimg_right_button_press_event $istyle"]
 
+        ::vtk::set_widget_variable_value $istyle RightButtonReleaseEventTag \
+                [$istyle AddObserver RightButtonReleaseEvent \
+                "::vtk::cb_istyleimg_right_button_release_event $istyle"]
+
         ::vtk::set_widget_variable_value $istyle StartPickEventTag \
                 [$istyle AddObserver StartPickEvent \
                 "::vtk::cb_istyleimg_start_pick_event $istyle $vtkiw"]

Wrapping/Tcl/vtkinteraction/bindings.tcl

@@ -97,6 +97,7 @@ namespace eval ::vtk {
         if {[$renwin GetInteractor] == ""} {
             set iren [vtkGenericRenderWindowInteractor ${renwin}_iren]
             $iren SetRenderWindow $renwin
+            $iren Initialize
         }
 
         # Mouse motion