'C# Zedgraph polyobj are pop up from graph frame

Before Zoom graph

After Zoom in graph

I made some Polyobj on zedgraph but whenever I zoom in graph, these polyobj pop up from it's graph frame. I want these polyobj that gone out of xaxis will disappear when resize xaxis(zoom) I searched some code, there is "ZOrder = ZedGraph.ZOrder.E_BehindCurves" like these... but it didnt work any things. I added every order option from A_ to H_behindall

please give me any hint about this situation.



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