title: WPF element host memory leak
body: <p>I'm having a strange memory leak using element host on windows forms.
  I have a main form, which opens another form, the one that only haves the elementhost control on it (which, at this point, does not have a wpf control child).
  Only 1 host form can be opened.
  Every time I open the form, the application memory raises by 20Mb, which are not free when the form is closes, so, after opening the host form several times, I run out of memory!.
  Now, if I remove the element host from the form, the memory remains stable.</p>
  
  <p>I have been running CLRProfiler and ANTS, but I have found that all the problem resides on the element host, and I haven't found any workaround for this.</p>
  
  <p>The wpfHost is used out-of-the-box, just dragged from the toolbar to the winForm.</p>
  
  <p>Any idea how can I solve this?</p>