Hello Martin Hollingsworth,
Thank you for the feedback. Unfortunately RadHtmlPlaceHolder is not working correctly in ChildWindow in the current officially released Q3 version of our controls (although it is working correctly with
version :2009.2.1002.1030 from the Q2 release).
However this issue is added in our to do list and will be fixed for the next major release. We apologize for the caused inconvenience. We advice you to use RadWindow instead if possible.
The important things is that when you host RadHtmlPlaceHolder into a RadWindow you will need to invalidate the arrange of the placeholder, when the location of the RadWindow changes:
this.LocationChanged += new System.Windows.RoutedEventHandler(radWindow_LocationChanged);
void radWindow_LocationChanged(object sender, System.Windows.RoutedEventArgs e)
Please find attached a sample project that demonstrates the usage of HtmlPlaceHolder in a RadWindow .
I hope that this will help you.
Please let us know if you have any other questions or you need some more help.
the Telerik team