c# - WPF Reference User Control in MainWindowViewModel Code -

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user control located in controls\tabcontrol. contains tabcontrol 2 tabitems (ruletab , diagramtab).

in mainwindowviewmodel class have:

private void showsavedialog()     {         system.windows.forms.savefiledialog sfd = new system.windows.forms.savefiledialog();         sfd.filter = "text file (*.txt)|*.txt";          bool? saveresult = sfd.showdialog() == system.windows.forms.dialogresult.ok;          if (saveresult == true)         {             string s = sfd.filename;             filepath = s;             savefile(s);             settitle(sfd.filename);             ruletab.header = new system.io.fileinfo(sfd.filename).name;             ruletab.focus();         }

ruletab (tabitem) isn't being found because it's in user control. how reference in class?

tabcontrol.xaml 

         x:name="tabeditor" x:fieldmodifier="public" mc:ignorable="d" d:designheight="300" d:designwidth="423">  <tabcontrol x:name="tabcontrol" x:fieldmodifier="public" width="auto" padding="0" margin="3" datacontext="{binding}">     <local:closeabletabitem header="diagram" x:name="diagramtab" x:fieldmodifier="public" height="25">         <image height="auto" x:name="resultimage" x:fieldmodifier="public" stretch="fill" width="auto" />     </local:closeabletabitem>     <local:closeabletabitem header="rulebase" x:name="ruletab" x:fieldmodifier="public" height="25" >         <grid>             <textbox height="auto" x:name="ruletext" x:fieldmodifier="public" width="auto" text="" acceptstab="true" acceptsreturn="true" verticalscrollbarvisibility="auto" horizontalscrollbarvisibility="visible" />         </grid>     </local:closeabletabitem> </tabcontrol>

there various possibilities if @ code-example think add event filesaved viewmodel , raise event after sucessfull saving.
mainwindow can register event , further processing such focus desired control.
setting header however, declare property in viewmodel , bind ruletabs header it. can set header in event, has unnecessary drawbacks.

update
desired here short example implementing event , property in viewmodel. assume viewmodel implements inotifypropertychanged. if not derives dependencyobject, declare read depencencyproperty filename instead of clr-property:

string m_filename; public event eventhandler filesaved;      private void showsavedialog()      {          system.windows.forms.savefiledialog sfd =              new system.windows.forms.savefiledialog();          sfd.filter = "text file (*.txt)|*.txt";           bool? saveresult = sfd.showdialog() == system.windows.forms.dialogresult.ok;           if (saveresult == true)          {              string s = sfd.filename;              filepath = s;              savefile(s);              filename=sfd.filename;             onfilesaved(eventargs.empty);         }  }  protected virtual void onfilesaved(eventargs e){    if(null != filesaved){        filesaved(this,e);    } }  public string filename{     get{return m_filename;}     private set{        if(value!=m_filename){            m_filename=value;            onpropertychanged(new propertychangedeventargs("filename"));        }     } }

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