protected bool FireSketchEvents {get; set;}

/// <summary>
/// Represents a custom map construction tool that enables sketching of all types of geometries (points, lines, polygons) with snapping and template support in
/// ArcGIS Pro.  ProSnippetConstructionToolLine is a specialized MapTool class configured for creating line geometries
/// </summary>
public class ProSnippetConstructionToolLine : MapTool
{
  public ProSnippetConstructionToolLine()
  {
    IsSketchTool = true;
    UseSnapping = true;
    // Select the type of construction tool you wish to implement.  
    // Make sure that the tool is correctly registered with the correct component category type in the daml 
    SketchType = SketchGeometryType.Line;
    //Gets or sets whether the sketch is for creating a feature and should use the CurrentTemplate.
    UsesCurrentTemplate = true;

    // set FireSketchEvents property to true
    FireSketchEvents = true;
  }
  //  ...