Invoke snapping in IEngineEditSketch

[ShenglinXu]

I have implemented IEngineEditSketch in a custom tool. In the OnMouseDown event handler, I can add a point to the edit sketch:
engineEditSketch.AddPoint(pPoint,true);

However, I don???t know how to invoke ESRI???s code to draw that blue circle in OnMouseMove event handler. Is it possible?
In another word, it is possible to invoke ESRI snap function in a custom tool programmatically? The key point is how to find out a snap point?

[SahaAswina]

have you solve your problem? I need your help

[ShenglinXu]

I have used my own code to get the snap point and draw a blue circle onMousrMove.
Seems works fine but not as that good as ESRI's one. For example, ESRI's little blue marker is transparent and the selected feature does not flashing.