Wrong Tag, I can't see the ExtendedDataGrid in XAML Design

Mar 23 at 4:22 AM
Hi. I am using ExtendedGrid.dll for using Auto Filter.

I put

xmlns:ExtendedGridControl="clrnamespace:ExtendedGrid.ExtendedGridControl;assembly=ExtendedGrid"

and ExtendedGridControl:ExtendedDataGrid

in XAML code for using it.

But I can't see the Datagrid in XAML Design Window.

But If I build it, No Error happens

I don't know why I can't see the Design. I just can see "Wrong Tag. Check Error list"

I am using .Net Framework 4.5.2 and Visual Studio 2017 RC

Please Help me.