Changing window properties in Visual C# from code-behind (WPF) -

i want background of wpf window change in specific situation (but other property). let's suppose name of window mywindow1. if treat window other item (like in windows forms), mywindow1 doesn't seem have background property set; read-only properties shown in auto-complete. if try creating new object this: mywindow1 w1 = new mywindow1(); w1 seems have right properties available changing in autocomplete, including background, , ide shows no errors. when try starting program, hangs.

what doing wrong, , best practice changing wpf windows properties code-behind in visual c# 2013?

try xaml.

< window x:class="wpf1.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"      title="mainwindow" height="350" width="525" > <grid background="{dynamicresource {x:static systemcolors.inactivecaptiontextbrushkey}}">  </grid> 

this dynamic resource

<window x:class="wpf1.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"       background="{dynamicresource windowbrush}"     title="mainwindow" height="350" width="525" >  <window.resources> <solidcolorbrush x:key="windowbrush" color="lightgray"/>  </window.resources> <grid >   </grid>  </window> 

it done static resource