# Windowless Mode

## Content



**HtmlHost for Silverlight** requires that the Silverlight plug-in's **Windowless** parameter be set to **True**. In windowless mode, the Silverlight plug-in does not have its own rendering window. Instead, the plug-in content is displayed directly by the browser window. This enables Silverlight content to visually overlap and blend with HTML content if the plug-in and its content both specify background transparency.

To set the **Windowless** parameter, you would complete the following steps:

1.  Create a Silverlight application that includes a C1HtmlHost control.
    
2.  Navigate to the Solution Explorer, and expand the YourProject.Web node (where YourProject is the name of the project).
    
3.  In the Solution Explorer, double-click the page in which the Silverlight plugin is declared. For example, double-click YourProjectTestPage.aspx or YourProjectTestPage.html file (where YourProject is the name of the project) to open the page.
    
4.  In the page scroll down to the \<div id="silverlightControlHost"> tag and add the following parameter in the list of parameters between the \<object>\</object> tags:
    

\<param name="windowless" value="true" />

5.  Save your change and return to the MainPage.xaml page.
    

When the **Windowless** parameter is not set to **True**, you may receive a warning when running the application.