Problem with customcontrol and its template behaviour

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C#

WPF

Hi all!

I have trivial problem which has been bugging me for some time, hope I can put it in words..

I have created customcontrol which inherits window. Basically its usage is as simply as using native wpf window + custom look and some extra methods with it.

My custom window works just fine when developing window which is startup window in wpf project. I can see my custom style in desingn mode and in the run.

The problem comes when I create predesigned custom window in codebehind I got my style but controls added into window wont show at all.

 // this is my custom control (window like). Style will apply BUT whatever predefined content wont appear!?

CustomWindow test = new CustomWindow (); 
test.Show();

I assume that there could be something wrong with style, I have defined free to desing area in my window style as follows

<adornerdecorator>
<contentpresenter margin="20" />
</adornerdecorator>

UPDATE:

Just noticed weird thing. When creating predefined window like this:

CustomWindow test = new CustomWindow (); 
Button btn = new Button();
btn.Content = "Hello";
test.Content = btn;
test.Show();

I get button into my custom window! So it seems that when creating custom window in codebehind it forgets its original xaml code where controls are placed in first place...

I hope you got idea :)

Cheers!