Hi all references are the same version. below is error and code
The property 'StyleManager.Theme' does not exist in XML namespace 'http://schemas.microsoft.com/winfx/2006/xaml/presentation'.
<TextBoxName="txtBoxKeyword"Grid.Column="1"Margin="0 1"FontSize="18"VerticalContentAlignment="Center"telerik:StyleManager.Theme="Windows7"TextChanged="txtBoxKeyword_TextChanged"/>