silverlight - W7P ListBox doesn't stay scrolled in the emulator -

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i have listbox in xaml page windows phone 7 app. starts out empty, populate items once retrieved web service. far works fine - items show in list , seems fine. problem have when try drag list scroll bottom (in emulator): can scroll down, release mouse button list springs top though hadn't scrolled @ all. insights why behave way?

<grid x:name="contentpanel" grid.row="2" margin="0,0,0,0" canvas.zindex="0">     <grid.rowdefinitions>         <rowdefinition height="auto"/>         <rowdefinition height="auto"/> <!-- edit: problem "auto" here should have been "*" -->     </grid.rowdefinitions>      <!-- removed other element brevity -->      <listbox name="infoboardlistbox" grid.row="1" selectionchanged="infoboardlistbox_selectionchanged"               margin="0,0,0,0" fontsize="26.667" /> </grid>

and method populates list:

    foreach (infoboard entry in boards.values) {         item = new listboxitem();         item.content = entry.name;         item.name = entry.id.tostring(); //used tell entry clicked         infoboardlistbox.items.add(item);     }

try setting height of second row * instead of auto; think it's size listbox thinks vs. available space.


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