Insert Note at User-Selected Point on Drawing Sheet Using SolidWorks API

I am developing a SOLIDWORKS add-in program using C# Windows Form. The goal is to allow user to click anywhere on a drawing sheet and insert a note with custom text that was pre-entered in the Textbox.
I am looking for a snippet that lets the program to wait for the user to click on a drawing sheet after user clicks 'Insert' button.
The issue is I couldn't find any event or method in API that prompts for the selection and awaits to get the selection result. Any help is appreciated. Thanks