c# - How to view collapsed elements while designing a WPF control? -

i set datagrid collapse when there no items

<datagrid name="datagrid"           visibility="{binding hasitems,                        elementname=datagrid,                        converter={staticresource booleantovisibilityconverter}}"> </datagrid> 

the problem is, appear on design mode. how it? should create fake data?

i tried

    private void usercontrol_loaded(object sender, routedeventargs e)     {         if (designerproperties.getisindesignmode(this))         {             this.datagrid.itemssource = new list<table> { new table() };         }     } 

but didn't work

if understand trying do, works me:

<window x:class="wpfscratch.mainwindow"     xmlns:local="clr-namespace:wpfscratch"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     mc:ignorable="d"     d:designheight="300"       d:designwidth="592"       d:datacontext="{d:designinstance local:mydesigntimeviewmodel, isdesigntimecreatable=true}"     title="mainwindow" sizetocontent="widthandheight"> <window.resources>     <local:booltovisibilityconverter      x:key="booltohiddenconverter"      truevalue="visible" falsevalue="hidden" />         </window.resources> <dockpanel>            <datagrid name="datagrid" itemssource="{binding people}"       visibility="{binding hasitems,                    elementname=datagrid,                    converter={staticresource booltohiddenconverter}}" autogeneratecolumns="true">      </datagrid> </dockpanel> 

public class mydesigntimeviewmodel {     public observablecollection<person> people     {                  {              return new observablecollection<person> {                                                          new person                                                              {                                                                  name = "simon"                                                              },                                                         new person                                                              {                                                                  name = "jack"                                                              }                                                      };          }     } }  public class person {     public string name { get; set; } }