Hi
Thanks for the demo. This does indeed work fine. I've looked back at the demo I sent you and my main app and the only thing I can see different is that they use implicit themes.
I've gone back over the guidance here: http://docs.telerik.com/devtools/wpf/styling-and-appearance/styling-apperance-implicit-styles-overview and applied this to the demo you attached. I have tried both methods of either including the xaml directly with the no-xaml dlls, or including the theme dll along with the no-binary dlls. In both instances I get the combo box failing to drop down properly. I've uploaded the demo you provided with the theme changes (here) and also a quick video of what I see on my side (here).
I must be doing something pretty fundamentally wrong when I add the theme I would think.
This is the path to the XAML I import: C:\Program Files (x86)\Telerik\UI for WPF Q1 2015\Themes.Implicit\WPF40\VisualStudio2013\Themes
This is the path to the binaries I import: C:\Program Files (x86)\Telerik\UI for WPF Q1 2015\Binaries.NoXaml\WPF45
I also tried the WPF40 folder, as I wasn't 100% sure if using the WPF45 binaries with the WPF40 theme noxaml would work, but I get the same result.
Thanks, Mike...