Allow shift selecting and hidding in the model tree

[ptc-893484]

Hi,

When I shift select a large number of items in the model tree I'm unable to hide the selected items if it includes the Pattern symbol.  If I unselect the pattern symbol I can hide all the components.  Make it so everything I shift select in the model tree can be hidden regardless of what it is.

      

[bduncan]

bad creo