I got the following code in the designer (which was autogenerated) but it has Telerik underlined with a red color that says
The type or namespace Telerik could not be found in the global namespace (are you missing an assembly reference?)
/// <summary>
/// RadEditorCtrl control.
/// </summary>
/// <remarks>
/// Auto-generated field.
/// To modify move field declaration from designer file to code-behind file.
/// </remarks>
protected global::Telerik.Web.UI.RadEditor RadEditorCtrl;
First check:
In Solution Explorer, select the project.
On the Project menu, choose Add Reference.
The Add Reference dialog box opens.
Select the tab indicating the type of component you want to reference.
In the top pane, select the component you want to reference, and then click the Select button. Press CTRL while clicking to select multiple components.
Tip - If the component you are looking for is not in the list, you may locate it using the Browse button (which you will more than likely need to do)
Click OK when you have selected all the components you need.
Selected references will appear under the References node of the project.