Let MultiTargetPath show path

I follow the “MultiTargetPathExample.cs” to try multitargetpath,
no error messages,but I only see the path just flash and gone !

maybe this line:
Debug.DrawLine (path[j],path[j+1],Mathfx.IntToColor (i,0.5F));

can I let the path remain on the screen ?

I find the way , just give DrawLine Duration time ^^

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