c# - Silverlight Context Menu IsOpen Exception? -

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i have project templated silverlight control. when add dll project (with templated control) in mainpage , want open context menu right click, error:

mainpage.xaml

<mycontrols:draw x:name="ctrdraw"></mycontrols:draw>

draw.cs (templated silverlight control)

_contextmenu.isopen = true; --> error

errormessage

errmsg  "unhandled error in silverlight application  code: 4004     category: managedruntimeerror        message: das festlegen von eigenschaft 'system.windows.frameworkelement.style' hat eine ausnahme ausgelöst."

init:

 private contextmenu _contextmenu;  private menuitem _contextmenuitem;

event:

private void map_mouserightbuttonup(object sender, graphicmousebuttoneventargs e) { _contextmenu = new contextmenu();  _contextmenuitem = new menuitem(); _contextmenuitem.header = "edit"; _contextmenu.items.add(_contextmenuitem); _contextmenuitem.click += new routedeventhandler(menuitem_click);

.....


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